Guava (Psidium guajava L.) is a tropical fruit tree grown widely across Asia, Africa, and the Americas. While most people know it for its sweet fruit, the plant also exhibits natural variation in leaf color, with some cultivars producing purple foliage and others producing the more typical green. The biological basis for this difference had not been systematically explored until now. The research team, led by scientists from Shihezi University and the Guangdong Academy of Agricultural Sciences, set out to characterize both the chemical composition and the gene expression patterns underlying the two leaf phenotypes.

The researchers employed targeted metabolomics to profile the flavonoid-related compounds present in the leaves of each cultivar. Flavonoids are a large family of plant secondary metabolites that include anthocyanins, which provide red, purple, and blue pigmentation, as well as proanthocyanidins, which are condensed tannins that contribute to astringency and defense. By quantifying these metabolites in both purple and green leaves, the team could determine which compounds accumulate preferentially in each phenotype.

The results revealed a clear divergence. In the green-leaved cultivar “Zhenzhu,” proanthocyanidins constituted a larger proportion of the measured flavonoid pool. In contrast, the purple-leaved “Ziguo” showed a predominance of anthocyanins, with cyanidin derivatives identified as the major pigment class. This finding indicates that the two cultivars are not simply differing in the total amount of flavonoids they produce but rather in how those flavonoids are partitioned between alternative end products of the same core pathway.

To understand the genetic basis of this metabolic shift, the researchers performed transcriptomic sequencing on the leaves of both cultivars. Transcriptomics allows scientists to measure the activity levels of thousands of genes simultaneously, revealing which genes are turned up or down in one condition relative to another. In this case, the comparison between purple and green leaves highlighted a set of differentially expressed genes involved in flavonoid biosynthesis.

One of the most striking observations concerned the proanthocyanidin branch of the pathway. The genes responsible for converting common flavonoid precursors into proanthocyanidins, including key structural enzymes such as ANR (anthocyanidin reductase) and LAR (leucoanthocyanidin reductase), were expressed at significantly lower levels in the purple-leaved cultivar. This downregulation suggests that “Ziguo” actively suppresses the proanthocyanidin pathway, leaving more substrate available for the competing anthocyanin branch.

The researchers also identified candidate genes involved in the transport and storage of these compounds within plant cells. Anthocyanins and proanthocyanidins must be moved from their site of synthesis in the cytoplasm to their final destinations, typically the vacuole, where they accumulate to visible concentrations. A glutathione S-transferase gene designated PgGSTF9 was expressed at notably higher levels in the purple cultivar, consistent with a role in shuttling anthocyanins to the vacuole. Conversely, a gene called PgDTX, implicated in proanthocyanidin transport, showed reduced expression in the purple leaves, potentially limiting the accumulation of proanthocyanidins in that compartment.

Beyond structural genes and transporters, the study also examined transcription factors, the regulatory proteins that control the expression of multiple biosynthetic genes at once. The researchers found that certain candidate regulatory genes showed differential expression between the two cultivars, suggesting that the shift in flavonoid partitioning is coordinated at the transcriptional level rather than arising from changes in a single enzyme. This type of coordinated regulation is common in plant secondary metabolism, where transcription factor complexes control entire biosynthetic branches in response to developmental or environmental cues.

The findings carry practical implications for guava breeding and ornamental horticulture. Purple-leaved guava varieties are valued for their visual appeal in landscaping, and understanding the molecular basis of leaf coloration could help breeders develop new cultivars with enhanced pigmentation. More broadly, the study contributes to a growing body of knowledge about how plants allocate flux through the flavonoid pathway, a question with relevance to fruit quality, nutritional value, and stress tolerance in many crop species.

From a scientific perspective, the work illustrates the power of combining metabolomics with transcriptomics to dissect complex metabolic phenotypes. Neither approach alone would have been sufficient to reveal the full picture. The metabolite profiling identified what compounds differ between the two cultivars, while the gene expression data pointed to the enzymatic and regulatory mechanisms responsible for those differences. Together, they provide a coherent model in which suppressed proanthocyanidin biosynthesis, enhanced anthocyanin transport, and altered transcriptional regulation jointly produce the purple leaf phenotype. Future research will likely focus on validating the candidate genes identified in this study through functional characterization, potentially using transgenic approaches or gene editing to confirm their roles in vivo.

Subject of Research: Flavonoid metabolism underlying purple leaf coloration in guava

Article Title: Integrated metabolomics and transcriptomics characterize anthocyanin accumulation in purple-leaved guava (Psidium guajava L.)

Article References: Xue, S., Lai, D., Chen, J., Hu, S., & Shao, X. (2026). Integrated metabolomics and transcriptomics characterize anthocyanin accumulation in purple-leaved guava (Psidium guajava L.). BMC Plant Biology. https://doi.org/10.1186/s12870-026-09972-y

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09972-y

Keywords: guava, anthocyanins, proanthocyanidins, flavonoid biosynthesis, leaf coloration, metabolomics, transcriptomics, Psidium guajava, cyanidin, plant pigmentation, gene expression, horticulture

Proanthocyanidins, often abbreviated as PACs, are a class of polyphenolic compounds famous for giving foods like grapes, cranberries, and cocoa their characteristic astringency. They are also increasingly recognized for biological activities that extend well beyond flavor, including antioxidant, anti-inflammatory, and antitumor properties. Previous studies in several cancer types have suggested that PACs can slow tumor growth, but their potential role as therapeutic adjuvants in bladder cancer specifically remained largely unexplored. The research team, led by Fernando Mendonça Diz and spanning institutions including the Pontifical Catholic University of Rio Grande do Sul and the Federal University of Rio Grande do Sul, set out to close that gap with a two-pronged strategy that combined classic laboratory experiments with modern systems biology.

The experimental centerpiece of the study was the T24 cell line, a human bladder carcinoma line derived from a grade III transitional cell carcinoma, which is widely used as a model for aggressive bladder cancer. When the researchers treated T24 cells with the black wattle proanthocyanidin extract, designated BWP, they observed a clear dose-dependent reduction in cell viability. Using the MTT assay, a standard colorimetric technique that measures metabolic activity as a proxy for the number of living cells, the team calculated an IC50 value of 11.67 micrograms per milliliter. In practical terms, this means that a very small concentration of the extract was enough to halve the survival of these aggressive cancer cells, a potency figure that immediately caught the researchers’ attention.

But killing cells is only part of the story; understanding how they die is what transforms an observation into potential medicine. To probe the mechanism of cell death, the team turned to flow cytometry, a technique that allows researchers to analyze thousands of individual cells and detect biochemical hallmarks of programmed cell death. The results were unambiguous: BWP treatment induced apoptosis in the T24 cells. Apoptosis, often described as cellular suicide, is the orderly dismantling of a cell that cancer cells notoriously evade. Triggering it selectively in tumor cells is one of the central goals of anticancer drug development, and the finding that a plant-derived polyphenol mixture can push bladder cancer cells down this path adds BWP to a growing list of natural products with pro-apoptotic activity.

Perhaps the most intriguing cellular observation came from nuclear morphometric analysis, a technique that quantifies the shape and irregularity of cell nuclei, which often change in characteristic ways when cells enter different biological states. The analysis revealed a shift toward what the researchers describe as a senescence-like phenotype, consistent with the morphological features of senescent cells. Cellular senescence is a state in which cells stop dividing but remain metabolically active, and inducing senescence in cancer cells, a strategy sometimes called therapy-induced senescence, is an emerging concept in oncology. The fact that BWP appears to push T24 cells toward both apoptosis and senescence-like features suggests that the extract may act through multiple parallel routes to suppress tumor growth, rather than through a single kill switch.

To move from cellular observations to molecular understanding, the researchers deployed an in silico systems biology approach, using computational tools to map the interactions between the constituent compounds of the black wattle extract and the human genome. This computational target identification exercise yielded a shortlist of candidate genes potentially associated with BWP activity, including BACE1, DNMT1, NOS1, NOS2, NOS3, PPARA, PPARG, PPARGC1A, and PTGS2. Each of these genes carries significant weight in cancer biology. DNMT1, for example, is a DNA methyltransferase central to epigenetic regulation and a known target of demethylating agents. The nitric oxide synthase genes NOS1, NOS2, and NOS3 govern the production of nitric oxide, a signaling molecule with complex and context-dependent roles in tumor progression and vascular biology. The PPAR family members PPARA and PPARG are nuclear receptors that regulate metabolism and inflammation, while PTGS2, better known as COX-2, is a canonical inflammation-linked enzyme long implicated in tumor development.

Computational predictions, however convincing, must be validated in living cells, and this is where the study’s experimental design shows its strength. The team performed quantitative reverse transcription polymerase chain reaction, or qRT-PCR, to measure whether BWP treatment actually changed the expression of the predicted target genes in T24 cells. The results confirmed that the extract modulated the expression of four of the candidate genes: DNMT1, BACE1, PPARG, and NOS3. This convergence between the computational predictions and the laboratory measurements is significant because it suggests that the systems biology pipeline used by the researchers can generate testable, and in this case test-worthy, hypotheses about how a complex natural extract interacts with human cellular machinery. BACE1, traditionally studied in the context of Alzheimer’s disease, has more recently been implicated in cancer cell biology, and its modulation by a plant polyphenol extract in bladder cancer cells adds a novel dimension to the findings.

The authors are careful to frame their work as hypothesis-generating rather than as proof of a new therapy, and that framing is scientifically appropriate. Extracts like BWP are complex mixtures containing many individual proanthocyanidin molecules of varying sizes and structures, and pinpointing which specific compound is responsible for which effect remains a challenge for future studies. Functional experiments, such as gene knockdown or knockout studies, will be needed to establish whether the modulated genes are genuinely driving the antiproliferative effects or are merely bystanders. Moreover, results obtained in a single cell line must be reproduced across a panel of bladder cancer models, including patient-derived cells, before any translational claims can be made. Animal studies and, eventually, carefully designed clinical trials would be required to determine whether black wattle proanthocyanidins could ever serve as a safe and effective adjuvant alongside existing bladder cancer treatments such as cisplatin-based chemotherapy.

Nevertheless, the study carries real significance on several fronts. First, it demonstrates that a low-cost, industrially abundant raw material, black wattle bark, which Brazil produces in large quantities, can yield compounds with measurable anticancer activity at low concentrations. Second, it showcases a methodological template for natural product research in the era of big data: rather than testing compounds blindly, the researchers combined in vitro pharmacology with computational target identification and gene expression validation, creating an integrated pipeline that could be applied to other plant extracts and other cancers. Third, the identification of specific molecular targets, from epigenetic regulators like DNMT1 to inflammatory mediators like PTGS2 and metabolic sensors like PPARG, gives the field a concrete starting point for mechanistic dissection rather than a vague notion that polyphenols are somehow good for you.

For patients and clinicians, the message is one of cautious optimism rather than immediate promise. No extract of black wattle is about to appear in an oncology clinic, and self-medication with tannin-rich products is not supported by this research. What the study does offer is a rigorous early-stage demonstration that nature’s chemical library still holds surprises, and that bladder cancer, a disease desperately in need of new options, may find one of them in the humble bark of a tree planted across Brazilian hillsides for leather tanning. As the researchers conclude, their findings provide a hypothesis-generating framework for future mechanistic and functional studies on proanthocyanidin-based therapies, and if those hypotheses hold up, the line between an industrial tannin and a cancer medicine may turn out to be thinner than anyone expected.

Subject of Research: Anticancer activity of black wattle bark proanthocyanidins against bladder cancer T24 cells, combining in vitro assays with gene expression profiling and computational target identification.

Article Title: In vitro and in silico evaluation of black wattle proanthocyanidins in bladder cancer T24 cells: gene expression profiling and computational target identification

Article References: Diz, F. M., Feltes, B. C., Xavier, F. A. C., Wieck, A., Pereira, V. J., Donadel, M. L. M., da Costa, J. C., Schrekker, H. S., Dorn, M., Morrone, F. B., & Ligabue, R. A. (2026). In vitro and in silico evaluation of black wattle proanthocyanidins in bladder cancer T24 cells: gene expression profiling and computational target identification. Cancer Cell International. https://doi.org/10.1186/s12935-026-04423-y

Image Credits: AI Generated

DOI: 10.1186/s12935-026-04423-y

Keywords: bladder cancer, proanthocyanidins, Acacia mearnsii, black wattle, T24 cells, apoptosis, senescence, gene expression, systems biology, natural products, DNMT1, PTGS2

The research team, led by Yenealem Solomon Kebede and colleagues at Charles Sturt University, analysed thirteen sorghum varieties sourced from field trials in Bellata and Croppa Creek in New South Wales, glasshouse trials in Queensland, and commercial seed suppliers. The varieties spanned the full colour spectrum of the species, from white-pericarp Liberty and experimental white lines through red commercial hybrids MR-Buster and MR-Bazley to brown B14A111 and the black-pericarp Shawaya Short Black-1. Whole grains were milled, defatted with hexane, and extracted using acidified acetone, a solvent system chosen specifically for its ability to liberate condensed tannins and anthocyanidins that more conventional methanol extractions often miss.

The results were striking. The black sorghum variety Shawaya Short Black-1 recorded a total phenolic content of 11.08 milligrams of gallic acid equivalents per gram, roughly seventy times higher than the white variety 2069A353-01, which measured just 0.16 milligrams per gram. The brown genotype B14A111 followed closely at 8.16 milligrams per gram. Red varieties occupied an intermediate range, while white genotypes clustered at the bottom. This gradient mirrors the biology of pericarp pigmentation: varieties carrying dominant B1 and B2 genes, and particularly those with the dominant spreader gene that produces brown pericarp, accumulate far higher levels of tannins and other polyphenols in their seed coats.

Antioxidant assays told the same story. Using three complementary tests, DPPH and ABTS radical scavenging, which measure hydrogen donation, and the FRAP assay, which measures electron transfer to ferric ions, the team found that black and brown sorghum consistently outperformed their paler counterparts. Shawaya Short Black-1 topped the DPPH and FRAP rankings at 18.94 and 18.96 milligrams of Trolox equivalents per gram respectively, while the brown B14A111 led the ABTS assay at 6.31 milligrams per gram. Statistical correlations between phenolic content and antioxidant activity were exceptionally strong, with Pearson coefficients approaching 0.98 for the DPPH assay, confirming that the polyphenols themselves, rather than some other grain constituent, drive the antioxidant effect.

The analytical centrepiece of the study was a high-resolution UHPLC-DAD-ESI-QTOF-MS/MS platform coupled with online ABTS detection, a setup that allowed the researchers to separate individual phenolic compounds, fragment them for structural analysis, and simultaneously detect which ones actively scavenge radicals. In total, eighty phenolic compounds were tentatively annotated across the thirteen varieties, spanning phenolic acids, phenol amides, flavanones, flavan-3-ols, flavanonols, flavones, isoflavonoids, 3-deoxyanthocyanidins, and proanthocyanidins. Identification confidence was graded according to the Schymanski guidelines, with authentic standards of ferulic acid, caffeic acid, procyanidin B3, luteolin, and apigenin anchoring the highest-confidence assignments.

Among the most significant discoveries were the high-molecular-weight condensed tannins. The team identified B-type procyanidin dimers, trimers, and tetramers, including an A-type procyanidin tetramer rarely reported in cereals, concentrated in the black and brown varieties. Previous sorghum profiling studies using aqueous methanol had failed to detect these larger polymers, and the authors attribute their success to the acidified acetone extraction, which is known to efficiently solubilise condensed tannins. These polymeric proanthocyanidins, built from flavan-3-ol units linked by C4-C6 and C4-C8 bonds, carry abundant free hydroxyl groups that make them potent electron donors, and they are increasingly linked to anti-inflammatory and antioxidant health benefits.

The study also documented an unusually rich array of phenol amides, with N,N’-dicaffeoylspermidine emerging as the most abundant compound across all thirteen extracts. These caffeic-acid-conjugated polyamines, found in multiple isomeric forms, have been associated in prior research with anti-diabetic, anti-cancer, anti-inflammatory, and neuroprotective activities. Their ubiquity across white, red, brown, and black genotypes suggests that even pale sorghum varieties contribute meaningful bioactive chemistry, even if their total antioxidant capacity is modest.

Genotype and environment both left their fingerprints on the chemistry. The same red and white varieties grown at Bellata showed slightly higher total phenolic content than those grown at Croppa Creek, while the red commercial lines A50, A88, and A90 from Queensland displayed notably lower phenolic levels than the New South Wales red varieties. The white Liberty variety, by contrast, was statistically indistinguishable across locations. This genotype-by-environment interaction underscores a persistent challenge for breeders: selecting for high polyphenol content requires either controlled growing conditions or multi-location trials to separate genetic potential from environmental noise. The authors acknowledge this limitation and plan follow-up studies using grains grown under identical conditions to isolate genetic effects.

Several compounds detected in the study had never before been reported in sorghum. Four isomers of catechin-(4alpha->8)-pelargonidin 3′-glucoside, anthocyanin dimers covalently linked to flavan-3-ol units previously known only from strawberries, were identified in the black and brown varieties. The team also tentatively annotated a procyanidin trimer triglycoside whose detailed structure remains unresolved, along with pyrano-flavonoid derivatives and the isoflavone puerarin, a compound with documented pharmacological activity against neurological, cardiovascular, and metabolic disease in preclinical models. The only 3-deoxyanthocyanidin detected, apigeninidin, was found in red varieties and adds to growing interest in these pigments, which are more stable under heat and pH stress than common anthocyanins and have shown chemopreventive properties in recent studies.

The practical implications reach from farm to pharmacy. For breeders, the study provides a chemical roadmap for selecting varieties with superior nutritional profiles, with black and brown genotypes as obvious lead candidates. For food manufacturers, the distinct phenolic profiles suggest opportunities to formulate sorghum-based functional ingredients targeting oxidative stress and inflammation. And for consumers, the message is simple: the darker the grain, the richer the antioxidant payload. As climate variability pushes agriculture toward hardier crops, sorghum’s combination of drought resilience and bioactive chemistry may finally earn it a place on plates well beyond its traditional strongholds in Africa and Asia.

Subject of Research: Phenolic composition and antioxidant activity of Australian-grown sorghum genotypes

Article Title: Comprehensive characterisation of phenolic composition and antioxidant activity across diverse Australian-grown sorghum ( Sorghum bicolor L. Moench) genotypes

Article References: Kebede, Y. S., Marefa, J., Budiono, B. P., Blanchard, C., & Santhakumar, A. B. (2026). Comprehensive characterisation of phenolic composition and antioxidant activity across diverse Australian-grown sorghum (Sorghum bicolor L. Moench) genotypes. Journal of Agriculture and Food Research, Article 103349. https://doi.org/10.1016/j.jafr.2026.103349

Image Credits: AI Generated

DOI: 10.1016/j.jafr.2026.103349

Keywords: sorghum, polyphenols, antioxidants, condensed tannins, proanthocyanidins, 3-deoxyanthocyanidins, UHPLC-MS/MS, functional foods, grain colour, genotype, flavonoids, food chemistry

Sea buckthorn, Hippophae rhamnoides L., is a deciduous shrub native to the Xinjiang region of China and now widely distributed across Asia, Europe and Canada. Its berries are loaded with carbohydrates, polysaccharides, polyphenols, vitamins and amino acids, and have been linked to antioxidant, anticarcinogenic, anti-inflammatory, antimicrobial and hepatoprotective effects. Proanthocyanidins, or PAs, are oligomeric and polymeric flavonoid polyphenols that accumulate in the fruit peel, seeds and stems. They are prized for potent antioxidant activity, cardiovascular protection, anti-obesity potential through pancreatic lipase inhibition, and enhancement of microvascular integrity. Yet most research has focused on PAs from the pulp, while the seed, leaf and peel fractions, which are routinely discarded during processing, have been largely ignored.

Extracting PAs from plant matrices is technically difficult because plant cell walls resist penetration and polyphenols degrade easily. Conventional approaches such as high-pressure extraction, supercritical carbon dioxide and ultrasonic-assisted extraction all suffer from high equipment costs, heavy organic solvent consumption, large energy inputs and secondary pollution risks. The Chinese team turned instead to deep eutectic solvents, or DESs, a class of designer solvents formed when a hydrogen bond donor and a hydrogen bond acceptor combine into a eutectic mixture. Typically built from cheap, biodegradable and environmentally benign components, DESs can dissolve polyphenols through hydrogen-bonding networks that are stronger than the interactions between water and the solutes themselves, loosening the binding forces that hold phenolic compounds inside the plant matrix.

The researchers tested five choline chloride-based solvent systems in which choline chloride served as the hydrogen bond acceptor, paired with five different donors: 1,4-butanediol, citric acid, lactic acid, urea and malonic acid. Water content proved critical, producing a characteristic bell-shaped yield curve. At low water levels the solvent is too viscous to penetrate the seed matrix efficiently; moderate water addition disrupts inter-solvent hydrogen bonds and lowers viscosity, boosting diffusivity. But beyond an optimum, added water competes with the PAs for hydrogen-bonding sites and hydrates the solvent components, weakening the DES-PA interactions that drive extraction. All five solvent systems significantly outperformed 75 percent ethanol, and the champion, choline chloride with 1,4-butanediol at 50 percent water, reached an absorbance of 0.255, a full 201.2 percent higher than the ethanol control.

With the solvent chosen, the team optimized the process using single-factor experiments followed by a three-factor, three-level Box-Behnken response surface design. The solid-to-liquid ratio exerted the strongest influence, followed by temperature and time, and the interaction between solvent ratio and temperature was highly significant because heating thins the solvent and speeds mass transfer only when enough solvent is present, while excessive heat destroys the thermolabile PAs. The model predicted a maximum yield of 48.025 milligrams per gram at a 41:1 milligram-per-milliliter ratio, 61.11 degrees Celsius and 3.29 hours. Validation runs at practical adjusted conditions delivered 47.591 milligrams per gram, a relative error of just 0.90 percent, with a regression fit of R squared 0.9964. Purification on D101 macroporous adsorption resin lifted the extract to 69.17 percent total proanthocyanidins.

Liquid chromatography-tandem mass spectrometry then revealed exactly what the green solvent had pulled from the seeds. Monomeric catechin and epicatechin appeared at mass-to-charge ratios of 291.08 and 292.08, while the dimeric proanthocyanidins B1 through B4 showed characteristic signals at m/z 579.15 to 581.15. Notably, no trimer or tetramer peaks were detected, indicating that sea buckthorn seed PAs consist almost entirely of monomers and dimers. Antioxidant testing across three independent assays showed the extract scavenging DPPH radicals at 4.61, ABTS cation radicals at 5.53 and reducing ferric iron at 6.24 micromoles of Trolox equivalents per milligram, respectable values that trailed only slightly behind pure ascorbic acid and confirmed the extract retained strong reducing and radical-scavenging capacity.

The second half of the study tackled the compounds’ Achilles heel: poor water solubility, instability under heat, pH swings and gastrointestinal conditions, and rapid metabolism in the body. Using ionic gelation, the team encapsulated the purified PAs within a composite wall of sodium alginate and carboxymethyl cellulose, extruding the mixture into a calcium chloride bath to form microcapsules with an encapsulation efficiency of 89.015 percent. Scanning electron microscopy showed intact, roughly elliptical particles without tears or holes, their surface folds a by-product of freeze-drying that increases surface area and may aid retention.

Spectroscopic and thermal analyses confirmed that the capsule walls protect without chemically altering the payload. Fourier transform infrared spectra showed hydrogen-bond interactions between the phenolic hydroxyl groups of the PAs and the polysaccharide wall, but no new peaks and no shift in the aromatic ring vibrations, proving a non-covalent, structure-preserving association. Thermogravimetric analysis was even more dramatic: free PAs lost mass sharply between 100 and 150 degrees Celsius and left only about 8 percent residual char at 600 degrees, whereas loaded microcapsules degraded gradually like the blank wall material, retaining roughly 26 percent residue and shielding the core from direct heat exposure, a critical advantage for foods and pharmaceuticals that undergo thermal processing.

Simulated digestion told a similar story. In gastric fluid at pH 2.0, free PAs flooded out, releasing 29.58 percent within the first 30 minutes and 53.64 percent by 180 minutes, while microencapsulated PAs released only 2.86 percent early on and 21.99 percent at 180 minutes, a delay of more than 31 percentage points. The team attributes this to the pH sensitivity of alginate, whose carboxyl groups protonate in acid, shrinking the matrix and blocking penetration. In neutral intestinal fluid the balance reversed: microcapsules reached a cumulative release of 45.65 percent at 180 minutes, surpassing the free PAs at 39.57 percent and still climbing, exactly the controlled, intestine-targeted release profile desired for maximizing absorption and bioactivity.

The authors are candid about the hurdles separating bench from factory. The choline chloride-1,4-butanediol solvent is relatively viscous, complicating continuous large-scale extraction, and freeze-drying inflates production costs. They propose screening lower-viscosity ternary solvent systems, coupling extraction with ultrasound or microwaves, blending in cheaper agricultural waste-derived polysaccharides such as corn fiber or rice bran cellulose, and ultimately running in vivo trials of bioavailability, tissue distribution and long-term safety. If those steps succeed, the implications extend well beyond sea buckthorn. The integrated solvent-and-encapsulation strategy offers a reusable blueprint for converting fruit-processing residues of every kind into stabilized, deliverable nutraceutical ingredients, turning industrial garbage into functional-food gold with nothing more exotic than biodegradable chemistry.

Subject of Research: Green extraction and microencapsulation of sea buckthorn seed proanthocyanidins using deep eutectic solvents

Article Title: Extraction and purification and microcapsulation of sea buckthorn seed proanthocyanidins using deep eutectic solvent-assisted extraction

Article References: Sun, Y., Sun, D., Ahmad, M., Li, X., Huang, M., Bi, X., Han, L., & Hao, G. (2026). Extraction and purification and microcapsulation of sea buckthorn seed proanthocyanidins using deep eutectic solvent-assisted extraction. Food Chemistry: X, 39, Article 104394. https://doi.org/10.1016/j.fochx.2026.104394

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104394

Keywords: sea buckthorn, proanthocyanidins, deep eutectic solvents, microencapsulation, antioxidants, green extraction, sodium alginate, carboxymethyl cellulose, response surface methodology, in vitro digestion, food by-products, functional foods