The scale of the underlying analysis is considerable. The authors screened roughly 1,100 records from major scientific databases including Scopus, Web of Science, PubMed, ScienceDirect, and Google Scholar. After removing duplicates and screening titles and abstracts, 530 studies remained for closer inspection, and 430 underwent full-text assessment against predefined eligibility criteria. The final synthesis drew on 183 studies, spanning molecular mechanisms, physicochemical properties, and industrial applications of both natural and synthetic gelling and foaming agents. This systematic approach matters because knowledge about gelation and foaming has long been scattered across different food systems, from confectionery to dairy to beverages, limiting the development of a unified understanding.

At the molecular level, gelation is a story of networks. A gel forms when dissolved biopolymers assemble into a three-dimensional mesh that traps water and other components, producing the firmness, elasticity, and mouthfeel consumers recognize in jellies, desserts, and confectionery. The review details how different agents achieve this through distinct mechanisms. High-methoxyl pectin, the classic jam-setting polysaccharide, requires an acidic environment around pH 2.5 to 3.5 and high sugar concentrations of 55 to 75 percent. The acid reduces electrostatic repulsion between negatively charged pectin molecules, while sugar binds available water, allowing hydrogen bonds and hydrophobic interactions between methyl ester groups to stabilize junction zones into a thermoreversible network.

Low-methoxyl pectins and alginates take a different route entirely: ionic cross-linking. Alginate, extracted from brown seaweed, gels in the presence of calcium ions through the well-known egg-box model, in which divalent cations nest between the guluronate regions of adjacent polymer chains. This chemistry powers the spherification technique beloved of molecular gastronomy, where an alginate-containing liquid dropped into a calcium chloride solution instantly forms a thin, flexible membrane around each droplet, producing caviar-like spheres. Carrageenans from red seaweed follow yet another path, undergoing a coil-to-helix transition upon cooling before metal ions such as potassium and calcium aggregate the helices into networks. The ion type dictates texture: potassium yields firm, brittle gels with kappa-carrageenan, while calcium produces softer, more elastic structures with the iota form.

Agar demonstrates perhaps the most dramatic thermal behavior of any hydrocolloid. When heated above 85 to 95 degrees Celsius, agarose chains float as random coils; on cooling to between 32 and 45 degrees, they align into ordered double helices stabilized by hydrogen bonds, which then aggregate into a rigid three-dimensional network. The large gap between setting and melting temperatures gives agar gels exceptional thermal stability, remaining solid at room temperature and beyond. This hysteresis, combined with high clarity and low syneresis, explains why roughly 90 percent of extracted agar serves as a gelling agent in meat and fish products and as a texture enhancer in dairy, and why it has become the gelatin substitute of choice for vegetarian and vegan formulations.

Gelatin, the workhorse of confectionery, operates through temperature-induced protein assembly. Derived from the hydrolytic degradation of collagen, it consists largely of glycine, proline, and hydroxyproline, organized into alpha, beta, and gamma polypeptide chains. Dissolved in hot water, its triple-helix structure unwinds into individual strands; as the solution cools, these strands re-form hydrogen bonds and hydrophobic interactions, weaving a mesh that traps water and sets into the familiar semi-solid. Beyond desserts, gelatin retains juices in canned meats, stabilizes marshmallows and gummy candies, and even serves as an edible film material, though its animal origin increasingly conflicts with consumer demand for plant-based alternatives.

Foaming, the review’s second focus, is governed by a different physical principle: the stabilization of gas bubbles within a liquid or semisolid matrix. Proteins act as natural foaming agents because they are amphiphilic, carrying both hydrophilic and hydrophobic regions. When egg whites are beaten, proteins such as ovalbumin and ovotransferrin unfold and realign at the air-water interface, forming a thin elastic film that encapsulates air and lowers surface tension. Surfactants like soy lecithin and monoglycerides perform the same job more efficiently, aligning at the interface to prevent bubble coalescence. In whipped cream, partially coalescing fat globules form a network that locks air bubbles in place, reinforced by a secondary protein layer, producing the smooth, creamy texture essential to consumer satisfaction.

The practical stakes of foam stability extend across the entire food landscape. In bakery, angel food and chiffon cakes depend on egg-white foams that expand during baking, with cream of tartar added to lower the pH and enhance stability. In beverages, the head on beer and the microfoam on a cappuccino both rely on surface-active proteins forming resilient layers around bubbles. In gluten-free baking, where the gluten network is absent, methylcellulose and egg whites provide the aeration and structure needed for a light crumb. Even fats can sabotage the process: oils disrupt the films around air bubbles, forcing formulators to adjust ingredient proportions and processing techniques carefully.

The review also spotlights emerging alternatives driven by the clean-label movement. Aquafaba, the cooking water from chickpeas and other legumes, contains proteins, polysaccharides, and saponins that give it foaming capacity and stability comparable to egg whites in certain applications, making it attractive for vegan and allergen-free formulations. Xanthan gum, produced by bacterial fermentation, remains stable across a remarkable pH range of 2.0 to 12.0 and in high-salt environments, excelling as a foam stabilizer and suspension agent. Yet natural ingredients bring their own problems: batch-to-batch variability in composition, molecular weight, and purity, driven by species, harvest season, and extraction method, can shift gel strength and viscosity unpredictably, complicating industrial standardization.

The authors conclude that the future lies in hybrid systems and advanced processing. Combining polysaccharides with plant proteins may deliver enhanced stability, resistance to thermal degradation, and reduced syneresis in clean-label formulations, while technologies such as high-intensity ultrasound, cold plasma, and high-pressure processing offer ways to tailor the interfacial behavior and rheological properties of non-animal biopolymers to match conventional agents. Ion-induced gelation with gellan gum under high pressure, which sets cold-set desserts without heating, hints at how processing innovation can preserve temperature-sensitive ingredients. Bridging fundamental knowledge of macromolecular interactions with industrial-scale application, the review argues, will be essential for building the next generation of stable, sustainable, and sensory-optimized foods, ensuring that the invisible chemistry inside every jelly and foam keeps pace with what consumers expect on the label.

Subject of Research: Mechanisms and applications of gelling and foaming agents in food systems

Article Title: Review on Gelling and Foaming Agents in Food: Mechanism and Applications

Article References: Kassa, M. G., Teferi, D. A., Satheesh, N., & Asemu, A. M. (2026). Review on Gelling and Foaming Agents in Food: Mechanism and Applications. Food Science & Nutrition, 14(10), Article e72437. https://doi.org/10.1002/fsn3.72437

Image Credits: AI Generated

DOI: 10.1002/fsn3.72437

Keywords: gelling agents, foaming agents, hydrocolloids, pectin, gelatin, agar, carrageenan, alginate, aquafaba, food texture, clean label, plant-based proteins

To understand the problem, it helps to understand how seaweed gel is actually made. The dominant extraction method is an alkaline process, in which raw seaweed—most importantly the red alga Gracilaria, which contains roughly 30 percent agar and supplies about 53 percent of global agar market demand—is treated with strong alkali. This treatment serves a precise chemical purpose: it converts L-galactose-6-sulfate into 3,6-dehydrated L-galactose, stripping sulfate groups from the polysaccharide chains that would otherwise weaken the gel. The full production line runs from raw seaweed through alkali treatment, neutral cleaning, acidification, bleaching, gel cooking, filtration, cooling, dehydration, and drying. At every stage, chemistry is working to transform a slippery marine plant into a stable, marketable colloid.

That chemistry comes at a cost. During alkali treatment, the alkali attacks the seaweed cell wall, dissolving pigments, polysaccharides, and proteins into the solution, which turns from transparent to a dark liquid known in the trade as black lye. Factories typically reuse industrial lye two or three times, but once the organic concentration climbs too high and the liquid becomes viscous, it can no longer serve. Roughly 30 percent of the alkali remains trapped in the seaweed itself and must be washed out with repeated rinsing and acidification. Producing a single ton of seaweed gel consumes between 8.08 and 10.5 tons of alkali and generates approximately 460 to 600 tons of low-concentration alkali washing wastewater. In Fujian Province, China’s leading seaweed-processing region, nearly 100,000 tons of high-COD waste lye are produced annually; if alkali is reused more than seven times, the chemical oxygen demand can exceed 100,000, making the process unsustainable.

The solid waste stream is equally troubling. Filtration of the gel liquor is hindered by the colloid’s tendency to form a film, so producers add perlite—a porous volcanic glass with a large specific surface area—as a filter aid. The result is a residue that mixes perlite with a substantial load of organic matter. Each ton of seaweed gel generates roughly 2.5 tons of waste residue on a dry basis, and Fujian Province alone produces more than 35,000 dry tons annually. Left to accumulate, this residue decomposes, releasing methane and sulfides and other pollutants. The residue is rich in resources—about 70 percent perlite, along with trehalose, protein, and polyphenols—yet aside from minimal fertilizer recycling and some use as animal feed, most of it ends up as industrial landfill.

The review systematically evaluates the treatment options available for waste lye, and finds most of them wanting. Neutralization followed by activated sludge degradation at sewage plants, the current industrial default, wastes the active substances dissolved in the lye and requires large quantities of acid. Activated carbon adsorption can clean filtered lye, but saturated carbon cannot be reused, creating new disposal problems. Electrochemical oxidation on Ru-iridium titanium electrodes can rapidly strip alkali from seaweed and recover caustic through electrolytic cell reactions—one study reported continuous alkali recovery over 20 days in a bipolar chamber—but it does not recover the organic components. Even green approaches such as using algae to absorb nitrogen and phosphorus from agar wastewater leave the question of concentrated waste lye unresolved.

The most promising lye technology, the authors argue, is electrodialysis combined with membrane concentration. Electrodialysis uses an electric field to drive charged ions selectively across membranes, separating them from the solution; it is already widely used in food processing, salt production, and wastewater treatment. In studies of seaweed-derived waste lye specifically, electrodialysis achieved a cumulative alkali recovery rate of 37 percent while separating alkali from organic matter with low energy consumption and no phase change. The authors’ own group reported a chemical oxygen demand removal rate of 69.97 percent and an alkali recovery rate of 45.31 percent for electrodialysis-treated lye. Membrane concentration adds another layer of capability: multistage membrane systems have recovered tea polyphenols with retention rates of 70 to 83.8 percent, and nanofiltration membranes have cleaned paper-making black lye to reuse standards. New alkali-stable membranes, including quaternized graphene oxide composites that survived 32 days in 2 mol/L sodium hydroxide at 60 degrees Celsius, are making these processes increasingly robust.

For the solid residue, the review champions a hybrid of enzymatic and chemical degradation over calcination, which is costly and can create air pollution, or acid hydrolysis alone, which generates waste acid. Enzymes are gentle catalysts that cleave the glycosidic bonds of polysaccharide macromolecules, producing low-molecular-weight oligosaccharides without generating additional waste. In a key demonstration, the research team enzymatically treated nearly half of the polysaccharides in the residue—excluding the perlite—and recovered specific active oligosaccharides including neoagarobiose, neoagarotetraose, cellobiose, and cellotriose, which initially cleaned the pores of the perlite. Food-grade hydrochloric acid and hydrogen peroxide then degraded the remaining polysaccharides lodged inside the perlite pores, restoring the filter aid’s structure. The recovered perlite achieved a permeability of 2.61 Darcy, meeting reuse standards, and performed comparably to commercial perlite in subsequent gel extraction.

Yet significant scientific puzzles remain, and the review devotes considerable attention to them. During electrodialysis, charges generated in the process are adsorbed by organic substances, which accumulate on the surface of the permeable membrane and reduce the lye recovery rate. Related studies have shown that organic compounds containing benzene rings adsorb especially strongly onto anion exchange membranes, restricting transmembrane ion migration, and that sodium ions alter the internal molecular structure of organic polysaccharides in ways that change how they foul membranes. On the residue side, the structural activity and recovery of organic polysaccharides depend on the specific structure of the enzymes used, and organic material conversion involves energy interactions during solid-liquid separation that are not yet fully understood. These mechanisms, the authors contend, are the critical barriers to industrial-scale recovery of organic active substances from seaweed gel waste.

To crack those mechanisms, the review proposes a concrete analytical toolkit. Trace-charge analysis combined with scanning electron microscopy can quantify how organic active substances aggregate and how charges adsorb and release on membrane surfaces, while charge diffusion models can simulate charge transport during electrodialysis with membrane concentration. For the residue, microcalorimetry and thermodynamic models can track the energy changes that occur as specific enzymes act on organic matter, and Fourier transform infrared spectroscopy, X-ray fluorescence, and X-ray photoelectron spectroscopy can reveal how elemental composition and chemical bonding change during recovery. Analogous work on lignin and sugarcane bagasse has already demonstrated that pyrolysis behavior and potential energy shifts correlate with structural changes during enzymatic hydrolysis, providing a template the seaweed field can follow.

The stakes extend well beyond one industry. Seaweed aquaculture reached approximately 36.3 million tons globally in 2021—97 percent of it cultivated—and China alone produced 2.72 million tons in 2022, with Fujian Province accounting for nearly 48 percent of that output and 60.36 percent of national seaweed gel production. As the blue industry expands, the review’s framework offers a way to close the loop: recover the alkali, reclaim the perlite, extract the oligosaccharides, and return cleaner water to coastal ecosystems. If electrodialysis and enzyme chemistry can be scaled from laboratory benchmarks to factory floors, the mountains of black lye and perlite-laden sludge that currently shadow the seaweed gel industry could become feedstocks rather than liabilities—turning one of aquaculture’s messiest byproducts into one of its most elegant success stories.

Subject of Research: Waste reduction and resource recovery technologies in seaweed gel (agar and carrageenan) production

Article Title: Frontier review of key reduction technologies and resource utilization of waste during the seaweed gel production process

Article References: Luo, X., Wu, Y., Wang, S., Xiong, Z., Du, X., Zheng, M., Zhu, Y., Jiang, Z., Li, Q., Ni, H., Li, Z., & Chen, Z. (2024). Frontier review of key reduction technologies and resource utilization of waste during the seaweed gel production process. Blue Biotechnology, 1(1), Article 12. https://doi.org/10.1186/s44315-024-00013-7

Image Credits: AI Generated

DOI: 10.1186/s44315-024-00013-7

Keywords: seaweed gel, agar, carrageenan, waste lye, electrodialysis, membrane concentration, perlite recovery, enzymatic degradation, polysaccharides, oligosaccharides, wastewater treatment, blue biotechnology

The global context makes the result timely. Seaweed cultivation has expanded roughly a thousand-fold in volume since 1950, reaching 35.2 million tons of live weight in 2021. The industry’s market value more than tripled from 5 billion dollars in 2000 to 17 billion dollars in 2021, with projections suggesting growth to as much as 85 billion dollars by 2026. Yet almost all of this production takes place in fully marine waters. Brackishwater ecosystems, where rivers meet the sea and salinity swings with tides and monsoons, remain largely untapped. The new study argues that these dynamic environments may actually favor certain species, offering nutrient concentrations and bioavailability that dispersed open-ocean waters cannot match.

The experimental setup was deliberately practical. The team deployed twelve bamboo rafts, each measuring three square meters, for a total cultivated area of 36 square meters in Muttukadu lagoon on the Bay of Bengal coast. Every raft carried twelve monoline tube nets with a 25-millimeter mesh, and each net was stocked with 1.2 kilograms of G. salicornia seed material collected from natural habitats, cleaned of epiphytes and debris, and held in fiber-reinforced plastic tanks before planting. The monoline design encourages horizontal growth, while the mesh size permits adequate water exchange and sunlight penetration, the two physical requirements that dominate seaweed productivity.

Growth was assessed at 15-day intervals alongside a full suite of water quality measurements. The results traced a classic cultivation curve. By the 15th day of culture, average biomass per tube net had climbed to 5.07 kilograms, corresponding to a specific growth rate of 9.59 percent per day. By day 30, biomass reached 7.67 kilograms, with the growth rate easing to 6.16 percent per day, and by day 45 the nets held 9.09 kilograms, with the rate declining further to 4.50 percent per day. This pattern of rapid early growth followed by gradual deceleration is typical of seaweed crops as density increases and light and nutrient availability per frond diminish, and it provides farmers with a biological signal for optimal harvest timing.

The researchers attribute the exceptional productivity to the lagoon’s physicochemical character. Salinity during the trial ranged from 20 to 31 practical salinity units, a spectrum across which G. salicornia displayed what the authors describe as euryhaline adaptation, the ability to thrive across a broad salinity range. Brackishwater systems, enriched by land runoff and tidal exchange, appear to supply essential nutrients in more concentrated and bioavailable forms than marine sites. The species’ tolerance of fluctuating conditions also echoes findings from Kenya, where a 42-day cultivation trial at Kibuyuni on the south coast demonstrated consistent growth and agar yields across distinct monsoonal seasons, and concluded that G. salicornia is more resilient than the widely farmed carrageenophyte Kappaphycus alvarezii.

The trial was not without drama. After the 45th day of culture, Cyclone Michang swept through the study area, generating strong winds and currents that tore away part of the biomass from the tube nets. The incident underscores the vulnerability of nearshore aquaculture to extreme weather, an increasingly pressing concern as storm intensity rises. Notably, however, the raft structures themselves withstood the cyclonic event, suggesting that the engineering of the system is robust even when the crop is not entirely secure. The authors argue that the overall production trend remained strong despite the loss, a testament to the species’ vigor and the method’s resilience.

Beyond biology, the study offers a sober economic analysis. Scaling the trial results to 50 raft units, each fitted with 18 monoline tube nets, the team estimated an annual harvest of 710.65 kilograms of dried seaweed. At a market price of 25 rupees per kilogram, gross revenue in the first year reached 124,362 rupees against a capital outlay of 90,000 rupees, yielding a first-year net profit of 24,362 rupees. From the second year onward, once capital costs are absorbed, net revenue rises to approximately 114,362 rupees annually. The short 45-day crop cycle permits seven harvests per year, and the authors note that dried Gracilaria sold to nearby industries within a 50-to-100-kilometer radius can fetch 40 to 60 rupees per kilogram, considerably more than the lower prices farmers receive when transport costs erode returns.

The livelihood implications are significant. The team’s assessment suggests that a hectare of seaweed cultivation, optimally stocked with 400 to 600 rafts, could support roughly 8 to 12 families. Because seaweed farming requires low capital, modest technical skill and no freshwater or feed inputs, it is particularly accessible to marginalized groups, especially women, who form a large share of the seaweed workforce in many countries. The crop’s applications span food, pharmaceuticals, cosmetics and biotechnology, anchored by agar, a gelatinous gelling agent for which Gracilaria species supply more than half of the world’s output. With natural seaweed stocks declining under overexploitation, the authors, citing earlier work on the depletion of Gracilaria edulis in Indian waters, argue that cultivation is no longer optional but essential for the agar industry’s future.

The environmental case is equally compelling. Seaweed farms absorb excess nutrients from the water, mitigating the eutrophication that plagues many coastal zones, and they buffer local chemistry against acidification. Farms also dampen coastal erosion, provide habitat for marine and brackishwater organisms, and sequester carbon, aligning the practice with multiple United Nations Sustainable Development Goals, from zero hunger and gender equality to climate action and life below water. In India, the policy environment is increasingly supportive, with the National Bank for Agriculture and Rural Development, the Tamil Nadu Department of Fisheries and the National Fisheries Development Board offering financial assistance, training and infrastructure, while private buyback agreements with processors such as Aquagri Processing Private Limited guarantee market access for farmers.

Challenges remain before brackishwater seaweed farming can scale. The authors flag limited awareness of the sector’s benefits among coastal communities, unreliable access to high-quality seed stock, and price volatility in the seaweed market as critical bottlenecks requiring targeted outreach, seed banks and market development. Returns also hinge on drying efficiency, operational discipline and environmental variability, demanding careful planning from prospective farmers. Still, the Muttukadu trial demonstrates that a lagoon once valued mainly for shrimp and finfish culture can grow a commercial agarophyte at rates that outpace marine farms. If replicated across India’s vast brackishwater margins, the humble red seaweed could become a cornerstone of the blue economy, turning tidal flats and estuaries into productive, climate-friendly farmland for the coastal communities that need it most.

Subject of Research: Raft-based cultivation of the red seaweed Gracilaria salicornia in brackishwater ecosystems

Article Title: Culture potential of Gracilaria salicornia in the brackishwater ecosystem: A multifaceted approach towards sustainable development goals

Article References: R., N. R., P., N. R., R., A., S., A. K., R., J., K., A., & C. P., B. (2025). Culture potential of Gracilaria salicornia in the brackishwater ecosystem: A multifaceted approach towards sustainable development goals. Blue Biotechnology, 2(1), Article 9. https://doi.org/10.1186/s44315-025-00032-y

Image Credits: AI Generated

DOI: 10.1186/s44315-025-00032-y

Keywords: Gracilaria salicornia, brackishwater aquaculture, seaweed farming, agar, raft cultivation, specific growth rate, coastal livelihoods, sustainable development goals, Muttukadu lagoon, blue economy, water quality, economic feasibility

The sheer diversity of these materials is striking. Chitin, the second most abundant biopolymer on Earth after cellulose, forms the structural skeleton of crustacean shells and fungal cell walls. When its acetyl groups are stripped away through deacetylation, it becomes chitosan, a positively charged polysaccharide whose amine groups give it antimicrobial activity, mucoadhesive behavior, and the ability to form gels, films, and nanoparticles. Agar and carrageenan, both sulfated or galactan-based polysaccharides extracted from red seaweeds, are already familiar workhorses of the food industry as gelling and thickening agents. Alginate, harvested from brown seaweeds, is famous for its ability to form stable hydrogels through the so-called egg-box model, in which divalent calcium ions bridge guluronic acid blocks on adjacent polymer chains. Ulvan, extracted from green seaweeds of the genus Ulva, remains comparatively obscure but carries sulfate groups and uronic acids that have attracted attention for immunomodulatory activity. Collagen and gelatin, meanwhile, come largely from fish skins, scales, and bones, offering an alternative to bovine and porcine sources that sidesteps both religious dietary restrictions and concerns about bovine spongiform encephalopathy.

One of the review’s most valuable contributions is its honest accounting of extraction yields, which vary enormously depending on both the source organism and the processing route. The authors report that chitosan-containing shrimp-shell residue yielded just 10.56 percent in one process, while chitosan extracted from mixed fishery waste reached 20.45 percent. Alginate from selected brown seaweeds delivered yields between 29.28 and 30.9 percent, agar from the red alga Gracilaria corticata ranged from 20.91 to 33 percent, and collagen from the skin of the Amazonian freshwater fish pirarucu came in at 27.8 percent. These numbers matter because yield, purity, and molecular weight collectively determine whether a marine biopolymer can be produced economically at industrial scale. A process that recovers a third of the available polymer is a very different commercial proposition from one that recovers a tenth, and the review makes clear that no single extraction protocol has yet emerged as the standard.

That variability is driving a wave of innovation in green extraction technology. Traditional chitin production relies on harsh mineral acid demineralization and alkaline deproteinization, generating significant chemical waste. Newer approaches replace or supplement these steps with ultrasound-assisted processing, subcritical water hydrolysis, supercritical carbon dioxide, and even ionic liquids that can dissolve chitin directly and allow deproteinization under milder conditions. Agar recovery has been boosted by combining subcritical water extraction with moderate electric fields, while collagen has been pulled from marine sponges and Atlantic cod skins using nothing more aggressive than water acidified with carbon dioxide. These techniques promise lower environmental footprints, better preservation of heat-sensitive bioactivity, and in some cases improved thermal stability and water-holding capacity in the final product, properties that matter enormously when the polymer is destined for a food matrix rather than a laboratory beaker.

The biological activities attributed to these polymers form the scientific heart of the nutraceutical case. Chitosan and its oligomers display broad-spectrum antibacterial activity, thought to arise from the electrostatic interaction between the polymer’s protonated amine groups and the negatively charged membranes of bacterial cells, disrupting permeability and ultimately killing the microbe. Chitosan has also been shown in animal models to ameliorate chemically induced ulcerative colitis by strengthening the intestinal barrier and reshaping the gut microbiome. Carrageenan fragments, particularly low-molecular-weight kappa-carrageenan hexamers, have demonstrated anti-inflammatory effects in macrophage cell lines by inhibiting the CD14 receptor pathway. Fucoidan, a sulfated polysaccharide from brown seaweeds, has activated natural killer cells in mice and reduced the viability of lung carcinoma and melanoma cells in vitro. Alginate acts as a soluble dietary fiber that slows gastric emptying and blunts postprandial glycemic spikes, an effect documented in humans with diabetes as early as the 1990s. Neoagaro-oligosaccharides derived from enzymatic hydrolysis of agarose show prebiotic effects, feeding beneficial anaerobic gut bacteria.

Yet the review is refreshingly blunt about the gap between laboratory promise and clinical proof. Recent human evidence genuinely supports the oral use of fish-derived collagen peptides, with clinical studies reporting improvements in skin elasticity, cellulite severity, and hair shaft diameter, supported by pharmacokinetic data showing that orally administered low-molecular-weight collagen peptides are absorbed and circulate in the bloodstream. Beyond collagen, however, most of the headline-grabbing health effects remain preclinical. Chitosan-alginate delivery systems, for example, have shown impressive results in animal models of inflammatory bowel disease, where colon-targeted microspheres co-delivering synbiotics and nanozymes ameliorated disease symptoms, and in controlled-release systems for antidiabetic peptides derived from rapeseed. But these are mouse and cell studies, not double-blind human trials. Similarly, the immunostimulatory effects of fucoidan on dendritic cells and the fat-binding claims once made for chitosan weight-loss supplements have not been translated into robust human evidence, and a controlled trial of chitosan supplementation in men and women found no significant effect on fat absorption.

Where marine biopolymers may have their most immediate practical impact is as delivery vehicles rather than as active ingredients themselves. Because alginates gel gently in the presence of calcium and chitosan is mucoadhesive and forms polyelectrolyte complexes with anionic polymers, the two are natural partners for encapsulation. The review describes alginate-membrane-modified nanochitosomes that stabilize apricot kernel-derived peptides with ACE-inhibitory activity, chitosan-alginate nanocarriers that control the release of therapeutic peptides, and alginate hydrogels used in everything from wound dressings to 3D bioprinting scaffolds. Encapsulation protects sensitive bioactive compounds from degradation in the stomach, masks undesirable flavors, and can be engineered to release payloads only when they reach the intestine, where absorption is most favorable. This carrier function may prove to be the bridge that carries marine biopolymers into commercial nutraceutical products even while their direct health effects await clinical confirmation.

Safety and standardization emerge as the review’s central caveats. Extraction yields that swing by a factor of three between studies signal a field that has not converged on reproducible manufacturing. Contaminant control is a genuine concern for any marine-derived ingredient, since shellfish waste and seaweeds can concentrate heavy metals, persistent organic pollutants, and pathogenic microbes from their environment. The authors also note lingering scientific debate around degraded carrageenan and inflammatory effects reported in some animal studies, underscoring the need for careful molecular-weight characterization and food safety assessment before new applications reach consumers. Their prescription is straightforward but demanding: standardized extraction and characterization protocols, rigorous contaminant screening, formal food safety evaluation, and, above all, well-designed randomized human trials to replace the current patchwork of in vitro and animal findings.

Even with those caveats, the trajectory is unmistakable. Global seafood processing generates millions of tonnes of shells, skins, bones, and heads every year, most of which are discarded or sold as low-value animal feed, and seaweed farming is expanding rapidly as a sustainable source of biomass that requires no freshwater, fertilizer, or arable land. Converting this waste stream into chitosan, collagen, alginate, and agar represents exactly the kind of circular bioeconomy that food systems worldwide are scrambling to build. The review’s authors conclude that marine biopolymers show considerable nutraceutical potential, and the evidence they assemble supports that verdict, provided the field resists the temptation to oversell preclinical results. If the coming decade delivers the standardized processes and human trials the authors call for, the humble shrimp shell and the lowly green seaweed may find themselves among the most valuable raw materials in functional food science, transforming what was once waste into the backbone of a new generation of ocean-derived health products.

Subject of Research: Marine-derived biopolymers and their potential applications as nutraceuticals

Article Title: Marine-derived biopolymers – the wider prospects as nutraceuticals

Article References: Sofi, F. R., Kumar, L. R. G., Sannejal, A. D., Aakila, Manjunatha, K. G., Surasani, V. K. R., Behere, G. S., Saba, K., Maqbool, H., Hussain, T., & Pathak, N. (2026). Marine-derived biopolymers – the wider prospects as nutraceuticals. Polymer Bulletin, 83(12), Article 650. https://doi.org/10.1007/s00289-026-06696-9

Image Credits: AI Generated

DOI: 10.1007/s00289-026-06696-9

Keywords: marine biopolymers, nutraceuticals, chitosan, alginate, collagen, gelatin, agar, carrageenan, ulvan, green extraction, functional foods, fishery waste valorization