Square bamboo shoots (Phyllostachys glauca) are nutritionally attractive—high in protein and fiber, low in fat—but their high water content and vigorous enzymatic activity make them notoriously perishable. Salting helps, yet salt alone does not stop microbial growth, and producers have traditionally leaned on synthetic preservatives such as sorbate and dehydroacetate to extend shelf life. With consumers increasingly demanding clean-label products, food scientists have been hunting for natural alternatives that actually work in difficult, wet, salty matrices.

ε-Polylysine hydrochloride, already approved under China’s GB 2760–2024 food additive standard, is a strong candidate: it shows broad-spectrum antimicrobial activity, thermal stability, and particular potency under acidic conditions. But adding it directly to food has drawbacks. The compound interacts with hydrolases and anionic molecules, losing activity quickly; it is strongly hygroscopic, making it prone to caking during processing; and it dissolves so fast that its antimicrobial effect fades before storage ends. Encapsulation was the obvious fix, but no one had systematically tested ε-polylysine hydrochloride microcapsules in salted bamboo shoots or measured their effects on texture and browning.

The team, led by Xianfen Cai and Yang Ye, used complex coacervation—a technique where oppositely charged biopolymers self-assemble around a core—to build their capsules. They mixed a 5 mg/mL solution of ε-polylysine hydrochloride with 12 percent soy protein isolate, added 3 percent chitosan, adjusted the pH to 6.5, and let electrostatic interactions knit the two wall materials into a dense shell around the antimicrobial payload. After centrifugation and freeze-drying, the result was a fine powder of microcapsules ready for characterization.

Optimization was rigorous. Single-factor experiments probed four variables—core-to-wall ratio, wall concentration, antimicrobial concentration, and the chitosan-to-soy-protein ratio—before an L9(3⁴) orthogonal array refined the recipe. Range analysis revealed that the chitosan-to-soy-protein ratio mattered most, followed by antimicrobial concentration. The predicted optimum, confirmed in a follow-up run, achieved an encapsulation efficiency of 98.63 percent, meaning nearly all the ε-polylysine hydrochloride ended up inside the capsules rather than floating free in solution.

Characterization confirmed the capsules’ quality. Laser particle sizing showed an average diameter of about 167 micrometers with a narrow, monodisperse distribution—far smaller than chitosan alone, which aggregates to roughly 400 micrometers. Scanning electron microscopy revealed wrinkled, porous sheet-like surfaces typical of SPI/CS matrices, with no visible free antimicrobial particles clinging to the outside. X-ray diffraction showed an amorphous structure, and thermogravimetric analysis demonstrated that encapsulation raised the thermal decomposition temperature by 25 to 30 °C compared with the free compound, a meaningful gain for industrial handling.

Release kinetics told the most important story. Free ε-polylysine hydrochloride dumped more than 99 percent of its payload within 10 hours in water—a burst that offers little lasting protection. The microcapsules, by contrast, released only about 30 percent in the first 10 hours, then slowed into a plateau, with cumulative release staying below 40 percent even at 72 hours. This sustained behavior likely stems from the chitosan matrix’s pH-responsive swelling and the dense protein-polysaccharide network restricting diffusion. Hygroscopicity tests added another win: the capsules absorbed just 3.4 percent moisture over 12 hours at 25 °C and 60 percent relative humidity, well below the 4.3 percent of the free compound and the 6.8 percent of empty capsules, reducing caking risk during storage and transport.

Agar diffusion assays against Escherichia coli and Staphylococcus aureus—chosen as representative Gram-negative and Gram-positive models rather than the actual spoilage flora—showed inhibition zones of 7.6 mm and 6.2 mm respectively for the loaded capsules, while empty capsules produced negligible zones. This confirms that ε-polylysine hydrochloride, not the wall material itself, drives the antibacterial effect, with the SPI/CS matrix acting primarily as a delivery vehicle. The larger zone against E. coli likely reflects differences in cell-envelope structure between the two bacterial types.

The real test came in salted bamboo shoots stored at 25 °C for 13 days across five treatment groups. Untreated controls and empty-capsule groups rocketed to roughly 1 × 10⁸ CFU/g by day 13. Chemical preservatives—a 1:1 mix of potassium sorbate and sodium dehydroacetate—helped initially but faded, reaching 5 × 10⁸ CFU/g. Free ε-polylysine hydrochloride showed strong early inhibition but weakened later, likely due to interactions with food components. The microencapsulated version, applied at an equivalent dose of 0.3 g/kg, kept counts below 1 × 10⁷ CFU/g throughout—a 96.1 percent reduction versus controls at day 13.

Quality metrics followed suit. By day 13, control shoots had faded to a b* yellowness value of 20.3 and softened to 98.3 N in hardness, while microcapsule-treated shoots retained 27.5 and 300 N respectively—dramatically better texture and color retention. pH stayed above 4.45 in the microcapsule group versus 3.9 in controls, and total acid accumulation was limited to 0.52 g/100 g compared with 0.85 g/100 g in untreated samples, indicating slower microbial acid production. The authors caution that safety and regulatory compliance of the complete SPI/CS formulation still need independent evaluation, and that release behavior in the complex, salty food matrix may differ from the distilled-water model. Still, the results mark a significant step toward clean-label preservation of one of China’s most beloved fermented vegetables.

Subject of Research: Microencapsulated ε-polylysine hydrochloride for preservation of salted bamboo shoots

Article Title: Effects of microencapsulated ε-Polylysine hydrochloride on quality and microbial indicators of salted bamboo shoots

Article References: Cai, X., Du, H., Wang, Y., Fei, S., Xu, S., Li, Y., & Ye, Y. (2026). Effects of microencapsulated ε-Polylysine hydrochloride on quality and microbial indicators of salted bamboo shoots. Food Chemistry: X, Article 104651. https://doi.org/10.1016/j.fochx.2026.104651

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104651

Keywords: ε-polylysine hydrochloride, microencapsulation, salted bamboo shoots, complex coacervation, chitosan, soy protein isolate, food preservation, natural antimicrobials, sustained release, clean label, food microbiology, Phyllostachys glauca

The scale of interest in plant natural products is striking. According to the review, PubMed listings for the phrase natural products have climbed to nearly 5,000 publications, up from 452 in the year 2000, and roughly a quarter of all medicines on the market trace their origins directly or indirectly to plant chemicals. Landmark examples include aspirin, derived from salicin found in willow species; quinine and artemisinin, isolated from Cinchona officinalis and Artemisia annua respectively; digoxin from Digitalis lanata; and the opium alkaloids morphine and codeine. Despite this rich history, delivering modern plant bioactives intact remains difficult because many secondary metabolites are highly sensitive to heat, light, oxygen, and pH swings, and compounds such as polyphenols often dissolve poorly in water, limiting absorption in the gut.

Encapsulation addresses these weaknesses by surrounding an active molecule with a thin protective coating of polymers, lipids, or biopolymers, in particles ranging from one to 1,000 micrometers for microsystems and one to 1,000 nanometers for nanostructures. The technique isolates the core material from environmental stress, can mask unpleasant flavors and colors, and permits release profiles that are delayed, sustained, or triggered by external cues. Nano-sized carriers add distinct advantages: their large surface area improves interaction with cells and biomolecules, and their small dimensions enhance cellular uptake and permit targeted delivery to diseased tissue. The review notes that recent clinical research has shown nano- and microencapsulation improving the pharmacokinetic and pharmacodynamic performance of curcumin, quercetin, resveratrol, epigallocatechin gallate, apigenin, and berberine, with enhanced outcomes in vitro and in vivo models of cancer, neurodegenerative, cardiovascular, metabolic, and inflammatory disorders.

The authors catalog a broad toolkit of manufacturing techniques. Spray drying, in which a liquid feed is atomized into hot gas to yield dry powder particles, is widely used but exposes thermolabile compounds to temperatures between 170 and 220 degrees Celsius. Freeze-drying is gentler, and complex coacervation exploits electrostatic attraction between oppositely charged biopolymers, typically proteins and polysaccharides, to deposit a coating around droplets. Emulsification creates oil-in-water or water-in-oil dispersions stabilized by surfactant layers, and electrospinning and electrospraying use high-voltage electrostatic forces to stretch or break polymer solutions into nanofibers and nanoparticles under relatively mild conditions. The choice of wall material, whether lipids, natural polymers such as chitosan, zein, alginate, and whey protein, or synthetic polymers such as poly(lactic-co-glycolic acid), ultimately determines encapsulation efficiency, stability, and release behavior.

Among lipid-based systems, the review distinguishes solid lipid nanoparticles, which consist of a solid lipid core surrounded by a phospholipid monolayer, from the newer nanostructured lipid carriers, whose cores blend solid and liquid lipids to form a less organized crystalline matrix with higher loading capacity and reduced drug expulsion during storage. Liposomes, spherical vesicles built from phospholipid bilayers, can carry both hydrophilic and hydrophobic cargo and have already reached the most advanced stage of clinical translation, alongside polymer-based nanoparticles, with cancer therapy as the leading application. Resveratrol encapsulated in liposomes combined with a quorum-sensing molecule reduced tumor development in murine models by approximately 70 percent, and liposomal anthocyanins were protected against degradation by light, pH shifts, enzymes, and ascorbic acid.

Polymeric nanoparticles offer another versatile platform. Curcumin encapsulated in PLGA nanoparticles halted the formation of diabetic cataracts in an animal model, while a PLGA-based silymarin nanocapsule demonstrated sustained release, increased bioavailability, and selective toxicity against prostate cancer cells. Mucoadhesive coatings such as chitosan, which binds to negatively charged mucosal surfaces in the gastrointestinal tract, can substantially improve oral absorption of otherwise poorly bioavailable compounds. Nanoscale solid dispersions also dramatically change dissolution behavior: dispersing compounds in an amorphous form inside carrier matrices boosted the dissolution rate of naringin by 20 to 55 percent and of quercetin by as much as 100 times, and pectin-whey protein nanocomplexes achieved encapsulation efficiencies of 83 to 98.5 percent for D-limonene.

The review also highlights electrospraying as a particularly gentle technique for sensitive molecules. Free beta-carotene degraded completely within 180 minutes of ultraviolet exposure, whereas encapsulated beta-carotene lost only about 20 percent under the same conditions. Because electrodynamic processes operate without the high temperatures of conventional spray drying and accommodate both hydrophilic and hydrophobic compounds across a wide range of wall materials, the authors consider them inexpensive, adaptable, and promising candidates for scaled-up industrial production of nanomaterials.

Safety and regulatory questions loom large over the field. Nanotoxicity depends on particle size, shape, surface charge, composition, and dose, and nanoparticles can cross biological barriers and accumulate in the liver, spleen, kidneys, lungs, and brain, potentially provoking oxidative stress, inflammation, and cellular damage. Niosomes, vesicles formed from nonionic surfactants with typical encapsulation efficiencies between 10 and 40 percent and as high as 75 to 90 percent in optimized systems, are one alternative with high biocompatibility and low toxicity, and proniosomes, dry free-flowing precursors that form vesicles on hydration, were developed to counter aggregation and leakage. Despite encouraging clinical results with established nanoformulations such as Doxil, Abraxane, and Onivyde, the review stresses that no plant-derived phytochemical nanoformulation has yet received approval from regulatory bodies for commercial use, partly because standardized guidelines for characterization, toxicological evaluation, and environmental risk assessment remain incomplete.

Looking forward, the authors anticipate personalized delivery systems tailored to individual physiological conditions, disease states, and genetic profiles, alongside growth in stimuli-responsive and targeted nanocarriers capable of releasing payloads at specific sites. They call for comparative, standardized studies to identify the most efficient and scalable encapsulation methods, more in vivo and clinical trials to establish long-term safety and bioavailability, and cost-effective, environmentally sustainable manufacturing to ease the bottlenecks of process reproducibility, formulation stability, and batch-to-batch consistency that currently slow industrial translation. If those hurdles can be cleared, encapsulated plant bioactives could move from laboratory curiosity to value-added products with longer shelf life, greater efficacy, and controlled delivery, transforming how food, pharmaceutical, and nutraceutical industries harness the healing chemistry of plants.

Subject of Research: Micro- and nanoencapsulation of plant-based bioactive compounds to enhance their stability, bioavailability, and therapeutic activities

Article Title: Trends in micro and nanoencapsulation of various plant-based bioactive compounds for enhanced biological activities: a review

Article References: Gill, A. R., Sharma, P., Siwach, P., Garg, V. K., Bhosale, M. S., & Choudhary, R. K. (2026). Trends in micro and nanoencapsulation of various plant-based bioactive compounds for enhanced biological activities: a review. Frontiers in Nanotechnology, 8, Article 1839002. https://doi.org/10.3389/fnano.2026.1839002

Image Credits: AI Generated

DOI: 10.3389/fnano.2026.1839002

Keywords: nanoencapsulation, microencapsulation, phytochemicals, bioactive compounds, nanoparticles, lipid nanoparticles, liposomes, niosomes, controlled release, bioavailability, drug delivery, Frontiers in Nanotechnology

The research team, led by Annamalai Jeyakumari with Vinod Abhiroop and Krishnamoorthy Elavarasan, prepared four sardine fish oil emulsion formulations, coded SE1 through SE4, using low- and medium-molecular-weight chitosan as the variable biopolymer. Low-molecular-weight chitosan, derived from shrimp shell with a viscosity of 75.2 centipoise, was paired with bovine gelatin and maltodextrin in SE1 and SE2, while medium-molecular-weight chitosan, with a viscosity of 386 centipoise, formed the basis of SE3 and SE4. The fish oil-to-wall material ratio was maintained at 1:4 by weight across all formulations, and the oil loading differed between the pairs, with SE1 and SE3 containing 0.5 percent fish oil and SE2 and SE4 containing 1.0 percent. Wall materials were dissolved in 1 percent acetic acid solution, the oil was added gradually under magnetic stirring, and the coarse emulsions were homogenized at 20,000 rpm for 5 minutes before being converted into powder by spray drying at an inlet air temperature of 160 degrees Celsius and an outlet temperature of 70 degrees Celsius.

The choice of chitosan as an encapsulating biopolymer rests on its structure, a beta (1,4)-linked copolymer of D-glucosamine and N-acetyl-D-glucosamine, which confers biodegradability, biocompatibility, film-forming capacity, and inherent antioxidant and antimicrobial activities. However, chitosan alone performs poorly as an emulsifier, so it must be combined with complementary wall materials. Bovine gelatin, extracted by hydrolyzing collagen, contributes excellent film-forming, emulsifying, and gelling properties, while maltodextrin acts as a drying aid with high water solubility, low hygroscopicity, and good powder-forming ability. Tween 20 was included as a non-ionic emulsifier to reduce interfacial tension and facilitate the formation of fine oil droplets. The interplay of these polymers determines how effectively the wall matrix wraps around the lipid droplets during the rapid moisture evaporation that characterizes spray drying, and the study set out to quantify precisely how chitosan molecular weight alters that interplay.

Measurements of the emulsions with a nanoparticle analyzer revealed significant differences in droplet size, polydispersity index, and viscosity among the formulations. SE1 exhibited the smallest droplet size at 1023 nanometers, followed by SE2 at 1258 nanometers, while SE3 and SE4 produced larger droplets of 1638 and 1845 nanometers respectively. The increase in particle size with rising chitosan molecular weight was attributed to enhanced intermolecular interactions and chain entanglement, which form larger droplets during emulsification. Polydispersity index values were lower for the low-molecular-weight formulations, 0.40 to 0.41, indicating narrower droplet size distributions, whereas the medium-molecular-weight systems showed higher values of 0.51 to 0.56, suggesting greater heterogeneity. Viscosity increased dramatically from roughly 9 centipoise in the low-molecular-weight emulsions to about 93 to 94 centipoise in the medium-molecular-weight systems, a more than tenfold jump that reflects the stronger chain entanglement of the longer chitosan molecules.

When the emulsions were spray dried, the resulting powders showed moisture contents ranging from 2.49 to 4.23 percent, all within the acceptable range for spray-dried lipid powders, which is critical for suppressing microbial growth, caking, and oxidative deterioration during storage. Encapsulation efficiency, the key indicator of how well the wall matrix retains oil within the microcapsules and minimizes surface oil exposed to pro-oxidant conditions, varied significantly from 53.26 to 82.06 percent. SE3, the medium-molecular-weight chitosan formulation with 0.5 percent fish oil, achieved the highest encapsulation efficiency at 82.06 percent, while SE2, the low-molecular-weight system with 1.0 percent oil, recorded the lowest at 53.26 percent. Protein content of the powders ranged from 21.00 to 36.75 percent, reflecting the proportion of gelatin in each wall blend, while fat content varied between 10.18 and 11.88 percent and ash remained low at 0.46 to 0.49 percent.

Powder flow characteristics, evaluated through bulk density, tapped density, Carr’s Index, and the Hausner ratio, differed significantly among the treatments. SE3 exhibited the most desirable flow properties, with the lowest Carr’s Index at 26.93 percent and the lowest Hausner ratio at 1.37, compared with values as high as 47.56 percent and 1.91 in SE2. According to conventional classification, an Hausner ratio above 1.34 and a Carr’s Index above 25 percent indicate poor flowability, and indeed all samples in the study fell into that category, a limitation commonly reported for microencapsulated oil powders. Nevertheless, the relative superiority of SE3 suggests that the denser encapsulating matrix formed by medium-molecular-weight chitosan improved powder handling. Hygroscopicity values ranged narrowly from 8.43 to 9.12 percent, and SE3 combined high encapsulation efficiency with moderate moisture uptake, consistent with the reported negative correlation between encapsulation efficiency and hygroscopicity.

Differential scanning calorimetry added a thermal dimension to the comparison. All formulations displayed a small transition between 50 and 75 degrees Celsius, attributed to the release of physically bound water from the microcapsule matrix, followed by prominent exothermic peaks associated with structural breakdown of the encapsulating wall. These decomposition peaks appeared at 166.15 degrees Celsius for SE1, 152.14 for SE2, 175.96 for SE3, and 167.18 for SE4. SE3 exhibited the highest decomposition temperature, indicating greater resistance to thermal degradation and a more compact, robust microcapsule structure arising from stronger interactions among the wall materials. Because the decomposition temperatures exceeded 150 degrees Celsius, the researchers concluded that the microencapsulated sardine oil could withstand moderate thermal processing conditions common in the food industry, including baking, extrusion, and blending with dry ingredients, without significant degradation of the encapsulating matrix.

The decisive test came from the storage studies, in which the powders were held for 21 days under both ambient conditions at 28 plus or minus 2 degrees Celsius and refrigerated conditions at 4 degrees Celsius, with oxidative stability monitored through thiobarbituric acid reactive substances, expressed as milligrams of malondialdehyde per kilogram. Under ambient storage, SE3 started with the lowest initial TBARS value of 0.41 and fluctuated only between 0.41 and 0.54 throughout the 21-day period, demonstrating an effective barrier against oxygen diffusion. In stark contrast, SE2 and SE4 rose sharply during the first week to 3.82 and 3.51 respectively, and SE1 climbed gradually from 1.77 to 2.57. Under refrigeration, SE3 again maintained the lowest values, ranging from 0.44 to 0.60, while SE4 showed moderate protection at 0.65 to 1.13 and the low-molecular-weight formulations fared worse. The consistently low TBARS values of SE3 under both conditions were linked to its higher encapsulation efficiency and reduced surface oil, which limited the lipid fraction accessible to pro-oxidative attack.

The study concludes that a wall system comprising 0.5 percent medium-molecular-weight chitosan, bovine gelatin, maltodextrin, and 0.5 percent fish oil is an effective carrier for sardine oil, delivering the highest encapsulation efficiency, the lowest oxidation markers, and the greatest thermal resistance among the formulations evaluated. Refrigerated storage provided additional protection for all samples, but the formulation itself proved the dominant factor in preserving oxidative quality. The researchers suggest that these microencapsulated sardine oil powders possess significant potential as omega-3-rich ingredients for functional foods and nutraceutical formulations, from bakery and dairy products to powdered beverages, instant soup mixes, and nutritional supplements, where processing and storage stability are critical for maintaining product quality and nutritional value. By demonstrating that the molecular weight of a single biopolymer can swing encapsulation efficiency by nearly 30 percentage points and suppress oxidation markers by more than sixfold, the work offers food technologists a precise, actionable lever for engineering stable omega-3 delivery systems.

Subject of Research: Microencapsulation of sardine fish oil with chitosan-based polymer blends for oxidative stability

Article Title: Microencapsulation of sardine fish oil using different molecular weight chitosan and polymer blends: a comparative study on oxidative stability and encapsulation characteristics

Article References: Jeyakumari, A., Abhiroop, V., & Elavarasan, K. (2026). Microencapsulation of sardine fish oil using different molecular weight chitosan and polymer blends: a comparative study on oxidative stability and encapsulation characteristics. Frontiers in Marine Science, 13, Article 1906530. https://doi.org/10.3389/fmars.2026.1906530

Image Credits: AI Generated

DOI: 10.3389/fmars.2026.1906530

Keywords: fish oil, omega-3, microencapsulation, chitosan, spray drying, oxidative stability, maltodextrin, gelatin, functional foods, sardine oil, sardine, fish

The molecule’s structure explains both its power and its problems. Astaxanthin possesses an extended conjugated polyene chain terminated by two polar rings, each bearing hydroxyl and keto groups. This architecture lets the molecule span lipid membranes, anchoring at the surface while the chain sits within the bilayer, where it can intercept reactive oxygen species on both the aqueous and lipid sides. But the polyene chain is also the site of vulnerability: each double bond can undergo oxidation, isomerization or cleavage when exposed to oxygen, elevated temperature or ultraviolet radiation. For food formulators, this means that an astaxanthin-rich ingredient can lose its color and its bioactivity during baking, pasteurization or months of retail shelf storage, a constraint that has historically kept the pigment confined to high-value niches such as aquafeed.

Not all astaxanthin is chemically identical, and the review places unusual emphasis on stereochemistry. The molecule exists in three stereoisomeric configurations, and the 3S,3’S form, produced naturally by the green microalga Haematococcus pluvialis, is described as the predominant bioactive configuration. Synthetic astaxanthin, manufactured by chemical synthesis for the feed industry, arrives as a mixture of isomers with different biological behavior. Beyond chirality, the geometry of the central chain matters too: the all-E (trans) configuration dominates in natural sources, but processing can convert a fraction of it to Z (cis) isomers, which are more soluble and, in some contexts, more bioavailable. Work cited in the review found that Z-isomer-rich diets enhanced egg yolk pigmentation in laying hens more effectively than all-E-rich diets, a finding that turns isomerization from a degradation problem into a potential design tool.

Esterification adds another layer of complexity. In Haematococcus and in shrimp by-products, much of the astaxanthin occurs as monoesters and diesters, with fatty acids attached to the hydroxyl groups on the terminal rings. These esters are generally more stable than the free molecule, and the attached fatty acids can influence both antioxidant performance and digestibility. Chromatographic analyses of shrimp and algal extracts have mapped these ester profiles in detail, and the review argues that understanding the ester composition of a given source is essential for predicting how it will behave in a food matrix. Free astaxanthin from the yeast Phaffia rhodozyma, by contrast, is unesterified, which simplifies formulation but may alter its stability and uptake.

Where does industrial astaxanthin actually come from? The review surveys three biological workhorses. Haematococcus pluvialis, a freshwater microalga that accumulates astaxanthin esters in thick-walled cyst cells when stressed by light and nutrient deprivation, remains the richest natural source and the dominant route for human nutraceutical products. The red yeast Phaffia rhodozyma (also called Xanthophyllomyces dendrorhous) offers fast fermentation in bioreactors and free, unesterified pigment, making it attractive for feed and increasingly for food applications. The bacterium Paracoccus carotinifaciens provides a dried cell powder used directly in animal diets. Meanwhile, shrimp processing waste, heads and shells that would otherwise be discarded, represents a circular-economy opportunity, with ultrasound-assisted extraction into vegetable oils, including extra virgin olive oil, demonstrating both good recovery and successful incorporation into functional foods with strong consumer acceptance.

Getting the pigment out of these tough biological matrices is half the battle. Haematococcus cysts are notoriously resistant, encased in a robust cell wall that must be disrupted before any solvent can reach the pigment. The review catalogs a progression of cell-disruption and extraction technologies: high-pressure homogenization, which physically fractures the cyst wall; pulsed electric fields, which permeabilize membranes and can trigger enzymatic processes that loosen the matrix; ultrasound-assisted extraction, which uses cavitation to accelerate mass transfer; and subcritical fluid extraction, which has been applied to yeast biomass after cell wall breaking. On the solvent side, green chemistry is displacing petrochemical solvents. Supercritical carbon dioxide with ethanol as a co-solvent extracts astaxanthin and lutein from red-phase algal biomass without leaving toxic residues, while deep eutectic solvents and ionic liquids have shown strong performance against conventional organic solvents, including acidic deep eutectic systems applied directly to Haematococcus biomass. Notably, one strategy recovered astaxanthin at high yield directly from wet algal biomass without any drying pretreatment, a potentially significant energy saving given how expensive dewatering microalgae can be.

Extraction, however, only delivers a fragile molecule into a hostile world, and the review devotes substantial attention to keeping astaxanthin intact. Microencapsulation is the workhorse: embedding the pigment in protective matrices of proteins, polysaccharides or lipid carriers shields it from oxygen and light. Researchers have produced food-grade microcapsules using vibrating nozzle technology, which generates uniform particles suitable for large-scale production, and have shown that the fatty acid composition of the encapsulating oil affects the kinetic stability of both astaxanthin and co-encapsulated alpha-tocopherol during storage. Stability testing in model food systems confirms the practical stakes, with incorporation and retention varying widely depending on the matrix, processing conditions and packaging. The message for manufacturers is that astaxanthin cannot simply be stirred into a recipe; it must be engineered into the product.

The most technically ambitious frontier is nanoscale delivery. Because astaxanthin is lipophilic and poorly water-soluble, its oral bioavailability is low, limited by micellar solubilization in the gut and by degradation en route. Nano-delivery systems attack this bottleneck directly. Nanoemulsions, nanoliposomes, lipid nanoparticles and polymeric nanocarriers can disperse the pigment in aqueous foods, protect it during digestion and improve its uptake by intestinal cells. The review highlights examples with almost pharmaceutical precision: a microenvironment-responsive pod-structured nanocarrier designed to release astaxanthin in the inflamed gut, where it ameliorated inflammatory bowel disease in experimental models, and a nano-lipidic astaxanthin formulated in a thermoreversible gel that showed efficacy in a model of drug-induced Parkinsonism. In the cosmetic sphere, astaxanthin-zeaxanthin nanoemulsions have been formulated into radiance serums evaluated for stability and anti-wrinkle activity, building on earlier clinical work showing cosmetic benefits and topical antioxidant protection for skin.

In animal agriculture, astaxanthin’s roles are both aesthetic and physiological. In aquaculture, it is indispensable: salmonids and other farmed fish cannot synthesize carotenoids and must obtain pigmentation from their diet, and the pigment also supports reproduction and survival. Supplementation studies show broader benefits, including enhanced hemato-biochemical parameters and innate immunity in Asian seabass, improved growth, immunity and tissue composition in largemouth bass, and better antioxidant capacity, immunity and disease resistance in coral trout. In poultry, dietary astaxanthin from red yeast improved growth performance, meat quality and even reduced fecal noxious gas emissions in broilers, while microalgae-derived astaxanthin improved cytoprotective capacity in the intestines of heat-stressed birds and benefited the gut health of yellow-feathered broilers. In laying hens, moderate and high dose supplementation trials have assessed responses in yolk pigmentation and physiology, with Z-isomer-rich formulations outperforming conventional all-E forms in yolk color enhancement.

The livestock evidence extends to mammals facing one of modern farming’s chronic challenges: heat stress. Astaxanthin supplementation ameliorated simulated heat stress in Sirohi goats by regulating physio-biochemical responses, altered muscle antioxidant activity and meat quality in broilers exposed to high ambient temperatures, reduced oxidative stress in sows with positive effects on piglet growth, improved antioxidant status and immunity in growing buffalo heifers when paired with copper, and even preserved sperm quality and antioxidant capacity in stored ram semen. Taken together, the review frames astaxanthin as a versatile tool for an agro-food sector grappling with climate pressure, consumer demand for natural ingredients and the valorization of processing waste. The obstacles that remain, cost-competitive production, scalable green extraction, and delivery systems that survive real-world food processing, are precisely the areas where the 2000 to 2025 literature shows the fastest movement, suggesting that the molecule once prized mainly for making salmon pink may soon be engineered into a far wider range of foods, feeds and therapies.

Subject of Research: Advances in astaxanthin sources, green extraction, stabilization, nano-delivery systems and nutritional applications in the agro-food industry

Article Title: Astaxanthin in the agro-food industry: advances in sources, processing, delivery systems, and nutritional applications

Article References: Qiang, J., Liao, S., Zhang, R., Piao, Y., Yu, M., Zhang, J., & Ren, L. (2026). Astaxanthin in the agro-food industry: advances in sources, processing, delivery systems, and nutritional applications. Food Science and Biotechnology. https://doi.org/10.1007/s10068-026-02345-z

Image Credits: AI Generated

DOI: 10.1007/s10068-026-02345-z

Keywords: astaxanthin, carotenoid, antioxidant, Haematococcus pluvialis, green extraction, nano-delivery systems, bioavailability, microencapsulation, aquaculture, animal feed, nutraceuticals, food science

The central concept in the review is bioavailability, defined as the proportion of ingested magnesium that is absorbed and utilized by the body. This is where the science becomes technically interesting, because the number printed on a supplement label reflects only the total elemental magnesium content of the compound, not how much of it will survive the journey through the gastrointestinal tract and into circulation. Magnesium oxide, one of the cheapest and most common forms on the market, delivers a high elemental load but dissolves poorly in intestinal fluids, and comparative studies have repeatedly shown that more soluble salts outperform it. In a randomized cross-over study, magnesium citrate produced higher urinary excretion and serum levels than magnesium oxide after single-dose administration, and earlier work comparing the two salts reached similar conclusions.

The review organizes supplement forms into a hierarchy of chemical classes: inorganic salts such as oxide and chloride, organic salts such as citrate, lactate, and aspartate, chelated forms in which magnesium is bound to amino acids, and advanced formulations that use encapsulation or controlled-release technology. Organic salts and chelates generally offer better solubility, gastrointestinal tolerability, and bioavailability than magnesium oxide, although the authors caution that outcomes vary with the specific formulation, the dose, the food matrix consumed alongside it, and individual physiological characteristics. In other words, there is no single universal winner; the performance of a magnesium product emerges from an interaction between chemistry and context.

Understanding how the intestine absorbs magnesium helps explain these differences. Absorption occurs along the small intestine and, to a lesser extent, the colon through two mechanistically distinct pathways. At low luminal concentrations, magnesium crosses the epithelium via saturable, transcellular channels, a process that can be regulated according to the body’s magnesium status. When luminal concentrations rise, a second, paracellular pathway allows magnesium to flow between cells down its electrochemical gradient in a non-saturable manner. This dual system has a practical consequence that many consumers miss: very large doses do not proportionally increase absorption, because the saturable pathway becomes overwhelmed and the passive pathway captures only a fraction of the remaining load. Splitting a dose or choosing a form that dissolves efficiently can therefore matter more than simply taking more milligrams.

Dietary context exerts a powerful influence on how much magnesium the gut actually takes up, and the review details both the enhancers and the saboteurs. On the positive side, fermentable fibers such as inulin, fructo-oligosaccharides, galactooligosaccharides, resistant starch, and resistant maltodextrin stimulate microbial fermentation in the colon, lowering pH and promoting mineral solubility and absorption. Human studies have shown that five weeks of short-chain fructo-oligosaccharide intake increased intestinal magnesium absorption and status in postmenopausal women, and similar benefits have been documented in adolescent girls. Proteins and medium-chain triglycerides also support absorption; medium-chain fatty acids improved calcium and magnesium uptake in patients with intestinal resections, and medium-chain triglyceride feeding enhanced mineral absorption in premature infants.

On the inhibitory side of the ledger sit phytate, oxalic acid, and certain polyphenols, all of which form poorly soluble complexes with magnesium ions in the gut lumen. Phytic acid added to white wheat bread significantly reduced fractional apparent magnesium absorption in human subjects, and spinach, a vegetable rich in both magnesium and oxalate, delivered less absorbable magnesium than kale, which has a low oxalate content despite comparable mineral content on paper. These findings carry a counterintuitive message: a food can be chemically rich in magnesium yet nutritionally poor as a source of it. Food processing can shift the balance, however, because sourdough fermentation activates endogenous phytase enzymes and a moderate pH decrease is sufficient to degrade much of the phytate in whole wheat flour, restoring the bioavailability of the grain’s minerals.

The review also highlights how formulation technology is reshaping the supplement landscape. Microencapsulated magnesium products, in which the mineral is wrapped in protective coatings, have shown improved absorption and fewer gastrointestinal side effects in comparative clinical studies. Sucrosomial magnesium, a formulation in which the mineral is carried inside phospholipid vesicles, demonstrated favorable bioavailability in both ex vivo work and a double-blinded cross-over study in healthy subjects. Extended-release matrices offer a different strategy: a magnesium lactate dihydrate extended-release caplet showed measurable absolute bioavailability in healthy volunteers, with the slow release designed to avoid saturating the intestinal transport pathways. These advanced systems reflect a growing recognition that the delivery vehicle is as important as the salt itself.

Measuring bioavailability remains a methodological challenge, and the review surveys the tools researchers use to compare forms. Stable isotope techniques allow true fractional absorption to be tracked from a labeled dose, while urinary excretion after single doses or in magnesium-saturated subjects provides a practical proxy. Serum and circulating ionized magnesium, intracellular magnesium in leukocytes measured by X-ray dispersion analysis, and in vitro models such as Caco-2 intestinal barrier cell cultures each add complementary evidence, though animal studies, including rat work comparing ten organic and inorganic magnesium salts, sometimes show smaller differences between forms than human trials, particularly when diets are high in phytic acid. The authors argue that supplementation should be assessed beyond elemental content alone, considering absorption, retention, and ultimately tissue utilization.

For the growing population of consumers reaching for magnesium to support sleep, muscle recovery, or cardiovascular health, the practical takeaway is nuanced. The form matters, with citrate, organic salts, and chelates generally outperforming oxide; the dose and timing matter, because absorption efficiency declines as dose rises; and the meal matters, because phytate-rich and oxalate-rich foods can bind magnesium while fermentable fibers, adequate protein, and medium-chain triglycerides can enhance its uptake. Individual factors, including age-related changes in gut function and the presence of intestinal disease or resection, further modulate how much of any given dose the body retains. As the review concludes, evaluating a magnesium supplement requires looking past the label’s elemental magnesium number to the chemistry of the salt, the sophistication of the formulation, and the dietary environment in which it is taken, a framing that may finally bring rigor to one of the supplement industry’s most crowded categories.

Subject of Research: Magnesium bioavailability, intestinal absorption mechanisms, and comparative performance of dietary supplement forms

Article Title: Advances in magnesium bioavailability: dietary factors, absorption mechanisms, and comparative performance of supplement forms

Article References: Gultekin, S., & Tomas, M. (2026). Advances in magnesium bioavailability: dietary factors, absorption mechanisms, and comparative performance of supplement forms. Food Science and Biotechnology. https://doi.org/10.1007/s10068-026-02319-1

Image Credits: AI Generated

DOI: 10.1007/s10068-026-02319-1

Keywords: magnesium, bioavailability, intestinal absorption, dietary supplements, magnesium citrate, magnesium oxide, phytate, oxalate, prebiotics, microencapsulation, chelated minerals, nutritional deficiency

The bacterium at the heart of the study was not chosen at random. The team isolated eleven endophytic bacterial strains from surface-sterilized guava roots collected in Una district, Himachal Pradesh, and screened them for the classic toolkit of plant growth promotion: indole-3-acetic acid production, phosphate solubilization, siderophore secretion, hydrogen cyanide production, and antagonism against fungal pathogens. One isolate, designated U35, consistently outperformed the rest, solubilizing 342.20 micrograms of phosphate per milliliter, producing 93.10 micrograms per milliliter of the auxin IAA, and inhibiting the growth of Fusarium oxysporum by 57.67 percent and Rhizoctonia solani by 61.33 percent. Sequencing of its 16S rRNA gene, submitted to GenBank under accession number PX919715, placed the isolate in the genus Serratia, a group increasingly recognized for its dual talents as a growth promoter and a biocontrol agent.

Free-living inoculants, however, face a hostile world once they leave the fermenter. Introduced cells must compete with established soil microbes, endure temperature swings and desiccation, and survive months of transport and storage before they ever encounter a root. The standard answer to this problem is microencapsulation, the immobilization of viable cells within a polymer matrix that shields them from stress and meters out their release over time. Sodium alginate, a gel-forming polysaccharide derived from brown algae, is the workhorse material for this purpose because it is biodegradable, non-toxic, inexpensive, and gels under gentle room-temperature conditions. But plain alginate beads are porous and prone to cracking, which compromises both their mechanical integrity and the protection they afford.

The Indian team’s solution was to reinforce the alginate with two additives. Corn starch acts as a filler that reduces shrinkage and porosity, maintains the sphericity of the beads, and improves bacterial viability during drying and storage. Chitosan nanoparticles, particles of a deacetylated chitin derivative measuring 80 to 100 nanometers, bring biocompatibility, film-forming ability, and antimicrobial properties to the matrix. Crucially, the researchers found that the nanoparticles’ effect on the encapsulated bacterium is concentration dependent. At 25 micrograms per milliliter, chitosan nanoparticles showed no inhibitory effect on Serratia sp. ABU35, but at 100 to 200 micrograms per milliliter they produced clear zones of bacterial killing, with the largest inhibition zone, 21.33 millimeters, appearing at the highest concentration. That dose-response relationship dictated the formulation: 25 micrograms per milliliter was the sweet spot at which the nanoparticles could improve the matrix without massacring its cargo.

The capsules themselves were made by ionic external gelation, a technique in which a sterile solution of 2 percent sodium alginate, 2 percent corn starch, and the nanoparticle suspension is mixed with a concentrated bacterial suspension and dripped into calcium chloride. Calcium ions cross-link the alginate into a gel network within 30 to 45 minutes, trapping the cells inside ovoid to near-spherical beads roughly 100 micrometers in diameter. Field emission scanning electron microscopy revealed smooth surfaces with minor irregularities that the authors suggest may actually aid bacterial immobilization and controlled release. Fourier transform infrared spectroscopy confirmed the chemical integration of all three components, showing the overlapping hydroxyl and amine stretching bands expected of a composite, while X-ray diffraction demonstrated that the sharp crystalline peaks of the individual polymers broadened and attenuated in the composite, indicating a predominantly amorphous structure, a property generally associated with better solubility and release behavior.

Performance testing showed that the optimized formulation, dubbed AlgSC, excelled on every metric the team measured. Encapsulation efficiency reached 99.23 percent, a 6.39 percent improvement over plain alginate beads. The swelling ratio climbed to 156.67 percent and moisture content to 78.33 percent, both the highest among the formulations tested, reflecting the hydrophilic character that starch and chitosan impart to the matrix. When beads were immersed in saline for sixty days, viable cells leaked out slowly at first, reached roughly 10 to the sixth CFU per milliliter by day ten, surged to 10 to the eleventh by day forty, and then stabilized near 10 to the eighth CFU per milliliter. Fitting the data to standard release models revealed a biphasic pattern best described by zeroth-order kinetics, meaning the bacteria emerged at a nearly constant rate independent of the remaining cell population, exactly the behavior a slow-release agricultural product should exhibit.

Shelf life was the study’s headline achievement. After twelve months at 4 degrees Celsius, the encapsulated bacteria retained 8.94 log CFU per gram, a survival rate of 75.19 percent, and even at room temperature they maintained 5.66 log CFU per gram, surviving at 43.98 percent. Free cells fared far worse: liquid cultures lost most of their viability within months, retaining only 19.44 percent survival after nine months in the refrigerator and 40.74 percent after just three months at ambient temperature. Just as importantly, the encapsulated cells kept their functional talents. After a full year in storage, the immobilized bacteria still produced 47.85 micrograms per milliliter of IAA, compared with 30.50 for free cells, and continued to form visible halos of phosphate solubilization on Pikovskaya medium. Antifungal activity also persisted, with the encapsulated formulation inhibiting F. oxysporum by 49.33 percent and R. solani by 53.33 percent, modestly below the liquid culture but still substantial.

The real test came in the greenhouse. In a one-year pot trial at Dr. Y.S. Parmar University of Horticulture and Forestry, six-month-old guava plants received either nothing, a full recommended dose of chemical fertilizer, liquid Serratia culture, encapsulated bacteria without nanoparticles, encapsulated bacteria with nanoparticles, or a combination of liquid and encapsulated inoculant. Every growth parameter responded significantly to the encapsulated treatment. Compared with untreated controls, plants given the nanoparticle-loaded capsules showed 125.26 percent greater shoot length, 83.75 percent greater root length, 92.32 percent greater shoot biomass, 158 percent greater root biomass, 136.08 percent greater plant height, 104.71 percent greater leaf area, and 142.86 percent more leaves. Against the liquid culture treatment, the encapsulated formulation delivered further gains of 21 to 49 percent across the measured traits, and plants receiving capsules containing chitosan nanoparticles outperformed those given nanoparticle-free capsules by 21.03 percent in shoot biomass and 30.45 percent in root biomass. The best overall results came from combining the liquid and encapsulated forms, an outcome the authors attribute to free cells colonizing the rhizosphere quickly while the capsules sustain the population over time.

The soil itself changed under the treatment. Rhizosphere soil from plants given the combined inoculant recorded the highest levels of total nitrogen at 428.45 kilograms per hectare, available phosphorus at 47.40 kilograms per hectare, and available potassium at 346.33 kilograms per hectare, along with the largest populations of bacteria, fungi, and actinomycetes. Dehydrogenase activity, a proxy for overall microbial metabolism, rose from 2.47 to 3.14 micrograms of triphenyl formazan per gram of soil, and phosphatase activity climbed from 6.30 to 8.61 micrograms of p-nitrophenol per gram, while urease activity remained statistically unchanged. Principal component analysis confirmed that the encapsulated treatments separated cleanly from the control and fertilizer-only groups, with the first two components explaining 99.87 percent of the variation in growth attributes.

The authors are careful to note the limits of their evidence. The pot trial used sterilized soil, an artificial environment stripped of the native microbial competition that inoculants face in real orchards, and all results come from controlled conditions rather than open fields. Field validation will be needed before the capsules can be promoted as a genuine alternative to synthetic fertilizer for guava, a crop that ranks fourth in cultivated area in India and is prized as a nutritional powerhouse rich in vitamins A and C. Still, the study demonstrates something rare in biofertilizer research: a formulation that solves the shelf-life problem in a single, elegant materials-engineering step, preserving both the viability and the functional repertoire of a beneficial bacterium for a full year. If the greenhouse promise survives contact with real soil, nanoparticle-reinforced biopolymer capsules could become a standard delivery vehicle for the next generation of microbial crop inputs.

Subject of Research: Encapsulation of the endophytic bacterium Serratia sp. ABU35 in a sodium alginate-corn starch-chitosan nanoparticle matrix for controlled-release biofertilizer delivery in guava

Article Title: Development of an encapsulated biofertilizer using a sodium alginate-corn starch-chitosan nanoparticle matrix for improved shelf life and controlled delivery of Serratia sp. ABU35 to enhance growth performance of guava (Psidium guajava L.)

Article References: Kalotra, S., Chauhan, A., Thakur, M., Tomar, M., & Kumar, G. (2026). Development of an encapsulated biofertilizer using a sodium alginate-corn starch-chitosan nanoparticle matrix for improved shelf life and controlled delivery of Serratia sp. ABU35 to enhance growth performance of guava (Psidium guajava L.). Discover Plants, 3(1), Article 423. https://doi.org/10.1007/s44372-026-00891-8

Image Credits: AI Generated

DOI: 10.1007/s44372-026-00891-8

Keywords: biofertilizer, Serratia sp. ABU35, microencapsulation, sodium alginate, chitosan nanoparticles, corn starch, guava, plant growth-promoting bacteria, shelf life, controlled release, soil health, sustainable agriculture

The review, authored by Sizhu Ren, Qing Sang, Zihan Yang, Can Jiang, Fan Wang, and Chunyan Xie of Langfang Normal University in Hebei Province, China, synthesizes recent advances in immobilization carriers, the factors that determine whether immobilized lactic acid bacteria thrive or fail, and the expanding range of applications for these encapsulated cells. The central insight is deceptively simple: surround the bacteria with a physical barrier and many of their weaknesses disappear. The matrix shields cells from harsh environments, extends their survival during storage and digestion, and allows them to retain metabolic activity across repeated use cycles, transforming a single-use biological reagent into a reusable industrial catalyst.

The technical logic behind immobilization rests on mass transfer and protection. When cells are entrapped in a hydrogel bead, adsorbed onto a porous support, or covalently anchored to a membrane, the carrier moderates their microenvironment. Protons, nutrients, and oxygen diffuse through the matrix at finite rates, so cells embedded deep inside a bead experience a buffered pH and a gentler oxidative climate than cells suspended freely in a fermenter. This is particularly important for lactic acid bacteria, which are notoriously sensitive to their own metabolic product. As fermentation proceeds and lactic acid accumulates, free cells slow down and die; immobilized populations, cushioned by their carriers, keep working longer and can be transferred from one batch of substrate to the next.

Carrier selection is where materials science meets microbiology. The classic choice is calcium alginate, a gel formed when sodium alginate droplets meet a calcium chloride bath, gently entrapping living cells under mild conditions that require no organic solvents or heat. Alginate beads remain the workhorse of the field, but the review highlights a rich portfolio of alternatives. Chitosan coatings tighten alginate’s notoriously loose mesh and reduce cell leakage. Polyvinyl alcohol cryogels, formed by freeze-thaw cycling, offer mechanical robustness for repeated-batch lactic acid production. Gelatin, carrageenan, pectate, xanthan gum, whey protein isolate, and even jujube mucilage have all been engineered into encapsulation systems, often in multilayered combinations designed to balance protection against diffusion limitations.

Inorganic and composite carriers extend the design space further. Mesoporous silica materials have been used to immobilize Lactobacillus rhamnosus for continuous cell-recycle fermentation, exploiting their rigid pores and high surface area. Diatomaceous earth, biochar derived from distiller’s grains, bacterial cellulose, and microtube array membranes have each served as scaffolds in different contexts. Metal-phenolic network coatings represent one of the newest strategies, wrapping individual Lactobacillus plantarum cells in a nanoscale armor that increases stability. The diversity matters because no single carrier suits every application: a probiotic destined for yogurt must survive refrigeration and gastric acid, while a fermentation catalyst in a packed-bed reactor must withstand shear forces and months of continuous operation.

The review emphasizes that performance depends on a web of interacting variables rather than on carrier chemistry alone. Alginate concentration controls gel pore size and mechanical strength; beads that are too dense starve their cargo of nutrients, while beads that are too loose leak cells. Bead diameter governs diffusion distances, with smaller particles improving mass transfer but complicating recovery. Initial pH, inoculum density, temperature, and the composition of the growth medium all shape how well immobilized populations establish themselves and how long they remain productive. Oxygen diffusion deserves special attention, since embedded cells in thick gel layers can become oxygen-starved, a problem that researchers have addressed with composite scaffolds that actively transport oxygen into the carrier interior.

On the application side, the most commercially visible use is probiotic delivery. Free probiotic cells often die during product storage and passage through the stomach, undermining the health claims printed on the label. Encapsulation changes the calculus. Calcium alginate carriers engineered for pH-responsive release protect cells in the acidic stomach and then dissolve in the neutral intestine, delivering viable bacteria where they matter. Alginate-gelatin hydrogel beads have been shown to improve the viability of Lactobacillus plantarum during simulated gastrointestinal digestion, cold storage, and exposure to beverage matrices. Microencapsulated Bifidobacterium bifidum and Lactobacillus acidophilus have demonstrated improved survival in white-brined cheese, and gellan fluid gels embedded in alginate beads have carried Limosilactobacillus reuteri into sour cherry juice, an acidic environment that would normally devastate free probiotics.

Industrial biocatalysis is the second major arena. Immobilized lactic acid bacteria have been deployed to produce lactic acid from renewable feedstocks including microalgae, sweet sorghum juice, pineapple waste, cheese whey, and molasses-enriched potato stillage, with cells immobilized in polyvinyl alcohol, pectate, or onto agro-industrial waste supports. Reusability is the economic hook: a packed bed of immobilized cells can run continuously or through repeated batches, eliminating the cost of growing fresh inoculum for every cycle. Immobilized Lactococcus lactis has been used for continuous nisin production, supplying the food industry’s most important bacteriocin preservative from whey permeate. Immobilized cultures have also driven malolactic fermentation in wine, converted glycerol into 1,3-propanediol and 3-hydroxypropionic acid, and even enabled one-pot biosynthesis of pharmaceutical intermediates such as idoxuridine using nanostabilized cells.

Beyond food and fermentation, the review situates immobilized lactic acid bacteria within the broader landscape of whole-cell immobilization, a field that spans wastewater treatment, bioremediation of heavy metals and crude oil, biohydrogen production, and even self-healing concrete. Lactobacillus plantarum immobilized on distiller’s grains biochar has been shown to adsorb cadmium ions from contaminated water, and immobilized LAB agents have been prepared for silage inoculation in animal agriculture. These adjacent applications matter because they share the same underlying engineering principles: choose a carrier that matches the operational stress, tune the diffusion properties, and design the system so the biological catalyst can be separated, reused, and eventually disposed of safely.

The challenges that remain are those of scale and standardization. Laboratory studies routinely demonstrate impressive viability gains and multi-cycle reuse, but translating bead-based systems into food-grade, regulator-approved, cost-competitive industrial processes requires carriers that are cheap, edible where necessary, mechanically durable at tonnage scale, and compatible with existing equipment. Diffusion limitations still cap the productivity of heavily loaded carriers, and cell leakage from soft gels remains a persistent nuisance. Yet the trajectory is clear. As the Langfang team’s synthesis makes plain, immobilization has moved from a niche preservation trick to a genuine platform technology, one that treats living bacteria as engineerable components of a material system. If the remaining engineering hurdles fall, the probiotic yogurt of the future may owe its potency not just to the strains inside it, but to the microscopic capsules that keep them alive.

Subject of Research: Immobilization carriers and applications of immobilized lactic acid bacteria in food biotechnology and industrial fermentation

Article Title: Recent advances in immobilization carriers, influencing factors, and applications of immobilized lactic acid bacteria

Article References: Ren, S., Sang, Q., Yang, Z., Jiang, C., Wang, F., & Xie, C. (2026). Recent advances in immobilization carriers, influencing factors, and applications of immobilized lactic acid bacteria. Food Science and Biotechnology. https://doi.org/10.1007/s10068-026-02261-2

Image Credits: AI Generated

DOI: 10.1007/s10068-026-02261-2

Keywords: lactic acid bacteria, cell immobilization, probiotics, microencapsulation, alginate, polyvinyl alcohol, fermentation, lactic acid production, bacteriocins, food biotechnology, biocatalysis, controlled release

A review published in BioMedical Engineering OnLine by researchers at the University of Taquari Valley (Univates) in Brazil argues that the field needs a fundamentally different therapeutic approach, and proposes one built on an unexpected pairing: plant-derived medicines packaged inside microscopic capsules. The team, led by corresponding author Fernanda Majolo and including Jamil Saleh, Bruna Caye, Gabriela Daiprai, Eduardo Henrique Caio and Davi Augusto Togni dos Santos, compiled evidence from PubMed, Scielo, Scopus and Web of Science using search terms covering peri-implantitis, microencapsulation, herbal medicines and local delivery systems. Their synthesis maps out how encapsulated phytochemicals could be delivered directly into the infected pocket around an implant, concentrating therapeutic compounds exactly where biofilms thrive while sparing the rest of the body.

The clinical problem the review addresses is substantial. Current management of peri-implantitis spans a spectrum from non-surgical debridement, in which the contaminated implant surface is mechanically cleaned, to surgical interventions that expose the site for more thorough decontamination and, in some cases, bone grafting. Conventional adjunctive therapies, including systemic antibiotics and antiseptic rinses, come with well-recognized limitations. Systemic drugs reach the implant site only after circulating through the entire body, diluting their effect at the target tissue and exposing distant organs and the gut microbiome to unnecessary pharmaceutical pressure. Overuse of antibiotics also fuels antimicrobial resistance, one of the most pressing threats in modern medicine. The authors emphasize that, despite decades of clinical experience, peri-implantitis still lacks a definitive, universally accepted treatment protocol.

Part of the difficulty lies in the biology of the disease itself. The review highlights that peri-implantitis often presents with greater severity than periodontitis, its counterpart around natural teeth, owing to anatomical factors and the composition of the biofilms involved. A natural tooth is anchored by a periodontal ligament and protected by a cementum-enamel interface, whereas an implant integrates directly with bone through a titanium surface whose microtopography, once colonized, can be extremely difficult to decontaminate. The soft tissue seal around an implant is also structurally different, potentially offering less resistance to bacterial invasion. Because the pathophysiology, microbiota and therapeutic responses of peri-implantitis are less thoroughly characterized than those of periodontitis, the authors deliberately contrast the rich periodontitis literature with the comparatively sparse peri-implantitis data, identifying knowledge gaps that must be closed before new therapies can be rationally designed.

Into this therapeutic vacuum, the review introduces phytotherapy, the medicinal use of compounds derived from plants. Plant secondary metabolites have long attracted attention for their anti-inflammatory and antimicrobial properties, and the authors argue that these bioactive molecules could help control the bacterial challenge and dampen the destructive inflammation that drives bone loss around implants. The appeal is twofold: phytochemicals offer pharmacological activity against the microbial and inflammatory components of peri-implantitis, and their use may reduce reliance on conventional antibiotics, easing the selective pressure that drives resistance. However, the review is candid about why plant medicines have struggled to enter mainstream clinical practice. In their native form, many phytochemicals suffer from poor stability, low solubility and limited bioavailability, meaning that when administered systemically they degrade, are poorly absorbed, or never reach therapeutic concentrations at the site of disease.

This is where microencapsulation enters the picture. Microencapsulation is a family of technologies that encloses active compounds within tiny protective shells, often only micrometers in diameter, made from biocompatible materials. The capsule wall shields the payload from degradation, masks unpleasant properties, and can be engineered to release its contents under specific triggers or at controlled rates over time. Applied to peri-implantitis, the concept is elegant: a gel, film or rinse loaded with microcapsules could be placed directly into the peri-implant pocket, where the capsules would steadily release antimicrobial and anti-inflammatory plant compounds in the immediate vicinity of the biofilm and the inflamed tissue. Localized delivery maximizes the concentration of drug where it is needed, minimizes systemic exposure and side effects, and, the authors note, can also reduce treatment costs.

The review goes beyond simply advocating for the idea; it sets out the technological parameters that determine whether a microcapsule formulation will actually work in the harsh environment of an infected implant site. Formulators must select appropriate wall materials, control particle size, tune loading efficiency and encapsulation yield, and engineer release kinetics that match the clinical need, sustaining therapeutic levels for days rather than dumping the entire payload at once. The encapsulated compound must remain stable during storage and active upon release, and the carrier itself must be biocompatible and, ideally, biodegradable. By defining these parameters explicitly, the authors provide a practical framework for researchers seeking to move from laboratory proof-of-concept to formulations that could plausibly be tested in patients.

From this convergence of phytotherapy and microencapsulation technology, the review identifies two strategic pathways for clinical application. The first is the development of antibacterial implant coatings: surfaces that carry encapsulated plant-derived antimicrobials could be applied to implants themselves, releasing protective compounds locally to prevent biofilm establishment from the moment of placement. Such coatings would shift the paradigm from treating established infection to preventing it, attacking the problem at the interface where bacteria first adhere. The second pathway focuses on treatment rather than prevention, promoting bioactive molecules that support tissue regeneration. Here, encapsulated phytochemicals would not only suppress the microbial and inflammatory drivers of peri-implantitis but also foster the regrowth of bone and soft tissue lost to the disease, addressing the structural damage that current therapies struggle to repair.

Recognizing that promising laboratory science routinely stalls at the clinic door, the authors devote part of their review to a regulatory roadmap for translating phytomedicines into approved therapies. Herbal-derived products occupy a complex regulatory landscape, and the path to clinical use requires standardized extraction and characterization of active compounds, rigorous preclinical testing, and well-designed clinical trials demonstrating safety and efficacy. The roadmap proposed in the review is intended to give researchers, manufacturers and regulators a shared framework, addressing the stability and bioavailability problems that have historically limited phytotherapy through the encapsulation technologies described, and aligning product development with the evidentiary standards expected of modern therapeutics. Without such a roadmap, the authors suggest, even compelling laboratory results risk remaining confined to academic journals.

The significance of the review lies less in any single experimental result than in the coherence of the strategy it assembles. Peri-implantitis is a growing public health burden as implant dentistry expands globally, and the limitations of systemic drugs, mechanical decontamination and surgery are increasingly apparent. By arguing that plant-derived bioactive compounds, once freed from their stability and bioavailability constraints through microencapsulation, can be deployed locally at the implant site, the Brazilian team offers a vision of treatment that is more targeted, potentially cheaper, and less likely to breed antibiotic resistance. Much work remains before encapsulated phytomedicines reach the dental chair, from validating formulations in preclinical models to navigating regulatory approval, but the review provides a structured starting point. For the millions of patients whose implants are threatened by bacterial invasion, the idea that relief might one day come from microscopic capsules of plant medicine, placed precisely where the trouble begins, is a proposition now backed by a clear technological and translational blueprint.

Subject of Research: Microencapsulated phytomedicines for localized treatment of peri-implantitis

Article Title: Microencapsulated phytomedicines: a localized therapeutic strategy for peri-implantitis

Article References: Saleh, J., Caye, B., Daiprai, G., Caio, E. H., dos Santos, D. A. T., & Majolo, F. (2026). Microencapsulated phytomedicines: a localized therapeutic strategy for peri-implantitis. BioMedical Engineering OnLine. https://doi.org/10.1186/s12938-026-01611-9

Image Credits: AI Generated

DOI: 10.1186/s12938-026-01611-9

Keywords: peri-implantitis, dental implants, microencapsulation, phytotherapy, drug delivery, biofilm, osseointegration, antimicrobial resistance, implant coatings, tissue regeneration, local drug delivery, biomedical engineering

The research, published in Food Science and Biotechnology, focused on developing spray-dried starter cultures for fermenting Pleurotus ostreatus, the common oyster mushroom. The team, led by Aem Nuylert with co-authors Benjamas Cheirsilp and Suppasil Maneerat, worked with two bacterial strains with complementary roles. Lactobacillus futsaii CS3, a lactic acid bacterium originally isolated from Thai fermented shrimp, is a known producer of gamma-aminobutyric acid, or GABA, an amino acid compound prized in functional foods for its potential calming and blood-pressure-lowering effects. Staphylococcus carnosus K21S22 served as a co-starter, contributing to the flavor and aroma development that makes fermented products appealing to consumers.

The central problem the researchers faced is one that haunts the entire probiotic and starter culture industry: spray drying is an efficient, scalable, and inexpensive way to turn liquid cultures into powders, but the process itself is lethal to many bacteria. As droplets are blasted through hot air in the drying chamber, cells experience simultaneous dehydration, heat shock, and oxygen exposure. Membranes rupture, proteins denature, and intracellular components leak out. Survival rates can plummet, which is why many commercial starter producers still rely on freeze drying, a gentler but far more energy-intensive and costly process that is difficult to scale for commodity applications.

Nuylert and colleagues attacked the survival problem from two directions. The first was preconditioning the cells before they ever reached the dryer. The team adapted Lactobacillus futsaii CS3 by growing it in the presence of 10 millimolar calcium chloride, a mild stress that triggers protective responses within the cell. This calcium adaptation strategy builds on earlier findings that intracellular calcium accumulation can stabilize bacterial membranes and improve heat resistance. In the study, the adapted cells showed markedly improved thermotolerance at 60 degrees Celsius, a temperature that would normally devastate unprotected lactic acid bacteria. The mechanism is elegant in its simplicity: by pre-stressing the cells with calcium, the researchers essentially taught them to brace for the thermal assault of spray drying.

The second line of defense was the protective carrier matrix in which the cells were embedded during drying. The researchers screened formulations and found that a matrix combining monosodium glutamate and maltodextrin, each at 10 percent, delivered the best results. Monosodium glutamate has a long history as a thermoprotectant in microbial preservation, helping to stabilize proteins and membranes during dehydration, while maltodextrin acts as a bulking agent that forms a glassy matrix around the cells, limiting molecular mobility and slowing degradation during storage. With this combination, post-drying survival reached 70.3 percent for Staphylococcus carnosus K21S22 and 59.2 percent for Lactobacillus futsaii CS3, figures that represent a substantial recovery of viable cells from an otherwise punishing process.

Survival through drying is only half the battle, however. A starter culture powder is useless if the cells die on the warehouse shelf. To test long-term stability, the team stored the dried powders in vacuum-packed conditions at 4 degrees Celsius for three months. The results were impressive: the cultures retained 86.4 percent viability for Lactobacillus futsaii and 84.1 percent for Staphylococcus carnosus. Vacuum packaging removes oxygen, limiting oxidative damage to cell membranes, while refrigeration slows the residual metabolic and chemical decay processes that gradually erode viability even in dried cells. Together, the drying formulation and the storage strategy produced a starter culture that could realistically sit in a food factory’s cold room for a full quarter and still perform.

The real test, of course, was whether these rehydrated powders could actually ferment mushrooms effectively. In application trials, inoculating oyster mushroom substrates with the spray-dried starters accelerated acidification and shortened the overall fermentation time compared with uncontrolled or slower fermentations. Rapid acidification is a critical safety and quality parameter in fermented foods, because a quick drop in pH suppresses spoilage organisms and pathogens before they can establish themselves. Faster, more predictable acidification also means shorter production cycles, which translates directly into economic benefits for manufacturers.

On the functional front, the cultures delivered on their GABA promise. Fermentations conducted with Lactobacillus futsaii CS3 alone produced GABA concentrations of 12.04 milligrams per gram, while the mixed culture of both strains achieved a nearly identical 12.02 milligrams per gram. This consistency is notable because it suggests that adding the Staphylococcus co-starter for flavor purposes did not come at the expense of the functional compound. For product developers, that is a valuable combination: a single fermentation process yielding both a bioactive ingredient and an improved sensory profile.

The sensory results added an intriguing layer to the findings. Using headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry, the researchers profiled the volatile compounds generated during fermentation and found that the mixed starter produced a distinct relative volatile peak-area profile compared with the single-strain fermentation. In the taste panel, the mixed starter earned the highest taste acceptance score of 7.85 and the highest overall acceptance score of 7.63. Importantly, the authors were careful to note that no causal relationship between the volatile differences and sensory acceptance was inferred, a scientifically cautious position that acknowledges the complexity of flavor perception, where non-volatile taste compounds, texture, and aroma all interact in ways that volatile profiling alone cannot fully explain.

Taken together, the study outlines an industry-relevant strategy for transforming oyster mushrooms into value-added fermented products. The workflow is practical: precondition cells with calcium, dry them in an MSG-maltodextrin matrix, vacuum pack at refrigeration temperature, and inoculate mushroom substrate for a fast, GABA-producing fermentation with strong consumer acceptance. Because spray drying is already a mature industrial technology used for everything from milk powder to instant coffee, the barrier to adoption is comparatively low. As demand grows for plant-based and fungal-derived functional foods, shelf-stable starter cultures like these could help fermented mushroom products move from artisanal novelty to mainstream supermarket staple, bringing a scientifically optimized blend of taste and function to a wider audience.

Subject of Research: Spray-dried starter cultures for GABA-enriched oyster mushroom fermentation

Article Title: Spray-dried starter cultures (Lactobacillus futsaii CS3 and Staphylococcus carnosus K21S22) improve taste acceptance and GABA production in oyster mushroom fermentation

Article References: Nuylert, A., Cheirsilp, B., & Maneerat, S. (2026). Spray-dried starter cultures (Lactobacillus futsaii CS3 and Staphylococcus carnosus K21S22) improve taste acceptance and GABA production in oyster mushroom fermentation. Food Science and Biotechnology. https://doi.org/10.1007/s10068-026-02321-7

Image Credits: AI Generated

DOI: 10.1007/s10068-026-02321-7

Keywords: spray drying, starter cultures, Lactobacillus futsaii, Staphylococcus carnosus, oyster mushroom, fermentation, GABA, microencapsulation, calcium adaptation, vacuum packaging, sensory acceptance, functional foods

The challenge the researchers set out to solve is familiar to anyone who follows the low-fat food trend. Health concerns about saturated fat intake have pushed consumers toward low- and non-fat dairy products, but removing milk fat from goat yogurt does more than cut calories. Fat contributes to the smooth mouthfeel, the firmness of the gel, and the water-holding behavior of the fermented milk matrix. It also carries bioactive compounds, including fat-soluble vitamins, that simply vanish when the fat is removed. The result is often a watery, grainy, nutritionally diminished product that few consumers want to eat twice.

Bakry and his colleagues turned to wheat germ oil, a byproduct of wheat milling that is rich in α-tocopherol, the most biologically active form of vitamin E, along with beneficial fatty acids. The oil itself is fragile: it oxidizes quickly, developing rancid flavors and losing nutritional value during storage. To protect it, the team encapsulated the oil inside microparticles whose walls were built from two complementary materials. The first was octenyl succinic anhydride-modified starch, or OSAS, a starch that has been chemically modified with hydrophobic octenyl groups, allowing it to anchor at oil-water interfaces and act as an emulsifier. The second was wheat gluten protein hydrolysate, or WGPH, produced by breaking wheat gluten proteins into smaller peptides.

The pairing is chemically elegant. OSAS provides interfacial stability, forming a protective barrier around each oil droplet that resists coalescence and shields the oil from oxygen. The protein hydrolysate adds its own advantages: peptides from hydrolyzed proteins often carry antioxidant activity of their own, scavenging the free radicals that drive lipid oxidation. In addition, protein hydrolysates can interact with the yogurt’s casein network during fermentation, reinforcing the gel structure from within. By varying the ratio of OSAS to WGPH in the wall material, the researchers could tune how the microparticles behaved both in the yogurt matrix and during digestion.

When the fortified microparticles were blended into non-fat goat yogurt, the effects on the physical structure were striking. Microstructural analysis using laser scanning confocal microscopy and scanning electron microscopy revealed that the control yogurt, made without any fortification, had a porous and relatively loose protein network, a typical defect of fat-free fermented gels. The fortified samples, particularly those containing higher levels of the wheat gluten protein hydrolysate, showed a denser and more compact structure. The microparticles appeared to act as active fillers within the casein gel, bridging gaps in the network and mimicking some of the structural roles that fat globules normally play.

The functional measurements backed up what the microscopes showed. Increasing the WGPH content in the microparticles significantly enhanced the yogurt’s water-holding capacity, meaning the gel retained its moisture instead of weeping whey into the container. Texture improved as well, with firmer, more cohesive gels. Oxidative stability rose in parallel, a direct benefit for the delicate wheat germ oil locked inside the capsules. Perhaps most notably, the antioxidant activity of the fortified yogurt climbed as WGPH levels increased, reaching 76.33 percent in the best formulation, a measurement of the product’s ability to neutralize free radicals in laboratory assays such as the DPPH test.

The team then asked what would happen when the yogurt met the digestive tract, using a simulated in vitro digestion model. Here the interfacial design of the microparticles proved decisive. Because the OSAS and WGPH layers stabilized the oil-water interface so effectively, lipid digestion proceeded in a more controlled manner, with the capsules releasing their cargo gradually rather than all at once. Crucially, this controlled release translated into higher bioaccessibility of α-tocopherol, meaning more of the vitamin E became available for potential absorption in the intestine. Encapsulation systems that protect a nutrient too well can paradoxically prevent its release, so achieving both protection during storage and accessibility during digestion represents a genuine balancing act that this formulation appears to manage.

Flavor turned out to be a story of trade-offs. Using an electronic nose and electronic tongue, the researchers found that the wheat gluten protein hydrolysate enhanced umami perception, the savory fifth taste associated with amino acids and small peptides. This is consistent with growing interest in protein hydrolysates as natural sources of umami peptides, and it suggests the microparticles could partially compensate for the flavor losses that accompany fat removal. However, the sensory picture was not uniformly positive. While moderate levels of fortification produced the best overall results, high levels of WGPH negatively affected sensory acceptability, likely reflecting the bitterness that protein hydrolysates can impart. The formulation identified as the best all-around performer, labeled YS10-P10, achieved the optimal combination of water-holding capacity, stability, texture, and sensory quality.

The study also documented subtler changes. The microparticles altered the color of the yogurt depending on the composition of the wall material, a factor that matters for consumer perception in a product category where appearance drives purchasing decisions. These color shifts, along with the texture and flavor effects, illustrate a central principle of modern food colloids: you cannot add particles to a fermented gel without changing the entire system, so the art lies in choosing wall materials whose side effects are beneficial rather than detrimental.

What makes this work notable beyond the yogurt itself is its demonstration that food byproducts can be upgraded into high-value functional ingredients. Wheat germ oil is a milling byproduct; wheat gluten hydrolysate derives from a widely available protein stream. Combining them into a delivery system that simultaneously improves texture, protects a fragile oil, boosts antioxidant capacity, enhances umami, and increases vitamin E bioaccessibility turns two low-cost inputs into a multifunctional fortifier for a growing market segment. The researchers caution that sensory acceptance limits how much hydrolysate can be used, and further work would be needed to confirm the findings in human digestion and consumer panels. But the core message stands: with the right molecular architecture at the oil-water interface, fat-free dairy does not have to mean flavor-free, texture-free, or nutritionally hollow. The capsules are invisible to the eye, but their effects on the yogurt, and potentially on the diner, are anything but.

Subject of Research: Encapsulation of wheat germ oil in starch-protein microparticles to improve non-fat goat yogurt quality and α-tocopherol bioaccessibility

Article Title: Enhancing the technological quality and α-tocopherol bioaccessibility of non-fat goat yogurt fortified with wheat germ oil microparticles stabilized by octenyl succinic anhydride-modified starch and wheat gluten protein hydrolysate

Article References: Bakry, A. M., Huang, J., Al Shik Mubarak, B. I., & Ibrahim, M. E. E.-D. (2026). Enhancing the technological quality and α-tocopherol bioaccessibility of non-fat goat yogurt fortified with wheat germ oil microparticles stabilized by octenyl succinic anhydride-modified starch and wheat gluten protein hydrolysate. Food Science and Biotechnology. https://doi.org/10.1007/s10068-026-02297-4

Image Credits: AI Generated

DOI: 10.1007/s10068-026-02297-4

Keywords: goat yogurt, wheat germ oil, microparticles, modified starch, protein hydrolysate, α-tocopherol, bioaccessibility, microencapsulation, antioxidant activity, non-fat dairy, umami, food science