Shellfish Chitosan Oligosaccharide (COS) — High-Purity, Water-Soluble Marine Chitosan for Pharmaceutical, Nutraceutical, Agricultural & Animal Nutrition Use

Shellfish Chitosan Oligosaccharide (COS) is a low-molecular-weight (<5,000 Da), fully water-soluble chitosan derivative produced through enzymatic hydrolysis of purified chitosan extracted from shrimp and crab shells. As the most established and highest-purity chitosan format available, marine-sourced COS combines decades of supply-chain maturity with the bioavailability and biological activity that has made chitosan oligosaccharide one of the most widely studied functional biopolymers in pharmaceutical, nutraceutical, agricultural, and animal nutrition science.

Chitosan Global supplies shellfish-derived COS in both Food Grade and Industrial Grade specifications. Food Grade COS is selected for its low molecular weight, high purity, and documented gut-health, cholesterol-management, and immune-modulation activity, making it a leading ingredient in dietary supplements, functional foods, and beverages. Industrial Grade COS is valued for its antimicrobial and chelating properties and is widely applied in agriculture, water treatment, biopolymer coatings, and animal feed formulation.

What Is Chitosan Oligosaccharide (COS)?

Chitosan oligosaccharide is a short-chain oligomer of chitosan with an average molecular weight below 5,000 Da, compared to the much larger polymer chains found in standard high-molecular-weight chitosan. Structurally, COS is a linear binary copolymer made up of β-1,4-linked 2-acetamido-2-deoxy-β-D-glucopyranose (GlcNAc) and 2-amino-2-deoxy-β-D-glucopyranose (GlcN) units, produced when the long chitosan chain is broken down most commonly through enzymatic hydrolysis, and in some processes through controlled acid hydrolysis into shorter degrees of polymerization typically ranging from 2 to 10 monomer units.

This shorter chain length is the defining structural feature of COS. It dramatically improves water solubility relative to free-base chitosan, which is otherwise only soluble in acidic conditions, and is associated with a substantial published research base describing antioxidant, antimicrobial, immune-modulating, cholesterol-lowering, and gut-health-supporting biological activity.

Why Shellfish-Sourced Chitosan Oligosaccharide?

Shrimp and crab shell waste remains the largest and most established global feedstock for chitosan and chitosan oligosaccharide production. This sourcing model benefits from mature, large-scale processing infrastructure concentrated in East and Southeast Asia, decades of characterization data, and the broadest range of available purity and molecular weight grades on the market today.

At the same time, shellfish-derived supply is subject to seasonal harvesting cycles and geographic concentration risk both flagged consistently across independent market analyses of the chitosan and glucosamine sector. Chitosan Global addresses this directly through rigorous incoming-material qualification, batch-level CoA testing, and supplier diversification, ensuring buyers receive consistent specifications regardless of upstream seasonal variability.

• Highest-purity, most extensively characterized chitosan source on the global market
• Broadest range of available molecular weight and degree-of-deacetylation grades
• Decades of safety, regulatory, and bioactivity research specific to marine-sourced chitosan
• Cost-effective at scale relative to fungal or insect-derived alternatives
• Suitable for human nutraceutical, pharmaceutical, agricultural, and animal nutrition applications from a single source material
• Batch-level CoA and quality testing at Chitosan Global mitigates seasonal supply-chain variability risk

How Shellfish Chitosan Oligosaccharide Is Made

Production begins with chitin extracted from shrimp or crab shell waste through a sequential demineralization (acid wash to remove mineral content) and deproteinization (alkaline treatment to remove residual protein) process. The purified chitin is then deacetylated under controlled alkaline conditions to produce high-molecular-weight chitosan.

This chitosan is subsequently broken down into short oligomers through enzymatic hydrolysis using chitosanase or related enzymes, which is generally preferred over acid hydrolysis because it produces more bioactive, soluble oligosaccharides with fewer process residues. The resulting chitosan oligosaccharide is purified, dried, and tested for molecular weight distribution, degree of deacetylation, purity, and microbial limits before being classified as Food Grade or Industrial Grade and released with a Certificate of Analysis (CoA) for each batch.

Physicochemical Properties & Technical Specifications

Parameter	Food Grade Specification	Industrial Grade Specification
Source	Shrimp/crab shell chitin	Shrimp/crab shell chitin
Appearance	White to light yellow powder	White to light yellow powder
Molecular Weight	< 5,000 Da	< 5,000 – 10,000 Da (broader range available)
Degree of Deacetylation (DDA)	≥ 90%	≥ 85%
Purity	High purity, food-grade compliant	Technical-grade purity
Solubility	Fully water-soluble	Fully water-soluble
Moisture / Loss on Drying	≤ 10%	≤ 10%
Ash Content	≤ 2%	≤ 3%
Heavy Metals (Pb, As, Cd, Hg)	Meets food-grade limits (ICP-MS tested)	Meets industrial-use limits
Microbial Limits	Meets USP/food-grade limits	Standard industrial limits
Typical Applications	Nutraceuticals, dietary supplements, functional foods, beverages	Agriculture, water treatment, biopolymer coatings, animal feed

 

Bioavailability: Why Molecular Weight Matters

Molecular weight is the single most important variable governing how a chitosan ingredient performs once it enters a formulation or biological system. High-molecular-weight chitosan forms viscous gels and is absorbed slowly across biological membranes. Chitosan oligosaccharide’s short chain length allows it to dissolve instantly in water at neutral pH, pass more readily across the intestinal barrier, and exhibit measurable bioactivity at lower use levels than standard chitosan which is why COS is the preferred chitosan format for dietary supplements, functional beverages, and animal feed applications where rapid absorption and dispersion are priorities.

Shellfish COS vs. Related Chitosan Derivatives

Choosing the right chitosan derivative depends on the molecular weight, charge profile, and functional groups your application requires. The table below positions Shellfish Chitosan Oligosaccharide against the most commonly compared Chitosan Global products.

For a salt-form alternative with enhanced acid-free solubility and stability, see Chitosan Oligosaccharide Hydrochloride. For the higher molecular weight parent compound used in film-forming and gel applications, see Chitosan Hydrochloride.

Derivative	Molecular Weight	Charge Profile	Best Fit Applications
Shellfish Chitosan Oligosaccharide (COS)	< 5,000 Da (low)	Cationic (amine-based)	Nutraceuticals, functional food, animal feed, agriculture, research
Chitosan Oligosaccharide Hydrochloride	< 5,000 Da (low)	Cationic, salt-stabilized	Pharmaceutical formulation requiring enhanced stability and acid-free solubility
Chitosan Hydrochloride	Medium-to-high	Cationic (amine-based)	General formulation, supplements, cosmetics requiring higher viscosity/film-forming
Carboxymethyl Chitosan	Medium-to-high	Amphoteric/anionic	Hydrogels, wound care, controlled-release matrices
Trimethyl Chitosan	Medium	Permanently cationic (quaternized)	Oral drug delivery, mucoadhesive systems, absorption enhancement
Quaternary Chitosan	Medium	Permanently cationic	Antimicrobial coatings, preservative systems, personal care
Sulphonated Chitosan	Medium	Anionic (sulfonate groups)	Anticoagulant/heparin-mimetic research, biomedical coatings
Phosphorylated Chitosan	Medium	Anionic (phosphate groups)	Bone tissue engineering, mineralization-related research

 

For cationic mucoadhesive comparisons relevant to oral delivery, see our guide on Trimethyl Chitosan for Oral Delivery; for hydrogel-focused formulation, see Carboxymethyl Chitosan for Hydrogels.

Benefits of Shellfish Chitosan Oligosaccharide

• Excellent water solubility at neutral pH no acid activation step required
• Low molecular weight supports rapid absorption and enhanced bioavailability
• Documented gut-health, cholesterol-management, and immune-modulation activity
• Antimicrobial, chelating, and plant-growth-promoting properties in Industrial Grade applications
• High purity supports pharmaceutical, nutraceutical, and food-grade applications
• Naturally cationic at neutral pH, supporting mucoadhesion and biological recognition mechanisms
• Most extensively characterized and cost-effective chitosan source available at industrial scale

Applications by Industry

Pharmaceutical & Biomedical Research

Low molecular weight chitosan oligosaccharide is widely studied as a bioactive component in drug delivery systems, supporting absorption-enhancement and controlled-release formulations. Its solubility profile also makes it suitable for nanoparticle formulation research, and ongoing research into joint-health and inflammation-management applications alongside glucosamine.

Nutraceutical & Functional Food

Food Grade shellfish COS supports gut health, cholesterol reduction, weight management, and immune modulation, and is widely used in dietary supplements, functional foods, and fortified beverages. Learn more in our chitosan in food industry guide.

Animal Nutrition & Aquaculture

Chitosan oligosaccharide is a well-established functional feed ingredient for aquaculture, poultry, livestock, and pet nutrition. Its mechanisms of action include balancing intestinal flora by inhibiting harmful bacterial adhesion, strengthening intestinal barrier function and villi growth, and activating digestive enzymes such as pepsin and trypsin supporting feed efficiency and reducing reliance on antibiotic growth promoters across modern feed formulation programs.

Cosmetics & Personal Care

In skin and hair care, marine-sourced COS functions as a lightweight film-forming agent, moisturizer, and natural preservative booster. See our broader resource on chitosan in cosmetics for formulation guidance and dosage ranges.

Agriculture, Water Treatment & Industrial Use

Industrial Grade shellfish COS is used as a natural plant elicitor and biostimulant in agricultural formulations, and is studied as a biodegradable flocculant in water treatment applications. Explore our water-soluble chitosan supplier overview, food-grade chitosan supplier page, and industrial chitosan manufacturer page for grade-specific sourcing.

Quality Control, Certifications & Documentation

• Every production lot is tested for molecular weight, degree of deacetylation, purity, moisture, ash, heavy metals, and microbial limits before release
• Certificate of Analysis (CoA) provided for every batch request your CoA directly via the button on this page
• Material Safety Data Sheet (MSDS/SDS) available on request for procurement and EH&S documentation
• Food Grade and Industrial Grade materials are tested and documented separately to ensure application-appropriate specification
• Full batch traceability from shrimp/crab shell source through final packaging, with supplier qualification designed to mitigate seasonal harvest variability

Packaging & Ordering Options

Option	Details
Sample	25 g sample, free shipping — ideal for formulation trials and lab evaluation
Small Batch	1 kg unit (+15% tariff where applicable, +$60 FedEx shipping)
Bulk	Bulk packs available — contact steve@chitosanglobal.com for volume pricing and lead times
International	Worldwide shipping available — contact us before ordering for rates and delivery options outside the USA

 

Why Choose Chitosan Global

Chitosan Global is a specialized chitosan derivatives supplier sourcing and producing high-performance chitosan and chitosan oligosaccharides from shellfish, fungal, and insect origins. Our shellfish-sourced materials are qualified against the seasonal and geographic supply risks common to this raw material category, and every lot ships with a CoA, with MSDS documentation available on request. Our team works directly with pharmaceutical formulators, nutraceutical manufacturers, animal nutrition companies, cosmetic chemists, and agricultural input producers to match the right chitosan grade to the application, from sample-scale trials to bulk production volumes.

Frequently Asked Questions

What is shellfish chitosan oligosaccharide?

Shellfish chitosan oligosaccharide (COS) is a low-molecular-weight (<5,000 Da), fully water-soluble chitosan derivative produced through enzymatic hydrolysis of chitosan extracted from shrimp and crab shells.

What is the difference between chitosan and chitosan oligosaccharide?

Chitosan is a long polymer chain, while chitosan oligosaccharide is a short-chain oligomer with a molecular weight under 5,000 Da, produced by breaking down chitosan through enzymatic or acid hydrolysis.

What is the difference between Food Grade and Industrial Grade COS?

Food Grade COS is produced to higher purity standards for human nutraceutical, supplement, and food applications, while Industrial Grade COS is suited to agricultural, water treatment, and industrial applications with a different specification profile.

Why does molecular weight matter for chitosan oligosaccharide?

Lower molecular weight dramatically increases water solubility and is associated with faster absorption and stronger measurable bioactivity, which is why COS is preferred over standard chitosan in supplements and feed applications.

What is the degree of deacetylation (DDA) of shellfish COS?

Shellfish chitosan oligosaccharide typically has a degree of deacetylation of 85% or higher for industrial grade and 90% or higher for food grade material.

Is shellfish chitosan oligosaccharide water-soluble?

Yes. Unlike high-molecular-weight chitosan, which is only soluble in acidic conditions, chitosan oligosaccharide is fully water-soluble due to its short chain length.

What biological activities have been documented for COS?

Published research has documented gut-health support, cholesterol reduction, immune modulation, antimicrobial activity, and antioxidant activity associated with chitosan oligosaccharide.

Is shellfish chitosan oligosaccharide used in animal feed?

Yes. COS is a well-established functional feed ingredient for aquaculture, poultry, livestock, and pet nutrition, supporting gut health, immune function, and growth performance.

How does chitosan oligosaccharide support gut health in animals?

Chitosan oligosaccharide can bind to harmful bacteria to inhibit their adhesion to the intestinal lining, promote beneficial bacterial growth, strengthen intestinal barrier function, and activate digestive enzyme activity.

What industries use shellfish chitosan oligosaccharide?

Shellfish COS is used in pharmaceutical research, nutraceuticals, functional foods and beverages, cosmetics, agriculture, water treatment, and animal nutrition/aquaculture feed.

Is there a supply risk with shellfish-derived chitosan?

Shellfish-derived chitosan feedstock is subject to seasonal harvesting cycles and geographic concentration in East and Southeast Asia; Chitosan Global mitigates this through rigorous supplier qualification and batch-level testing.

What is the minimum order quantity (MOQ)?

A 25 g sample is available with free shipping. A 1 kg unit and bulk pack options are also available; contact steve@chitosanglobal.com for bulk pricing.

Do you provide a Certificate of Analysis (CoA)?

Yes. Every production batch is tested and issued a CoA, available on request via the “Get COA” button on this page.

Is an MSDS/SDS available?

Yes. A Material Safety Data Sheet is available on request for procurement and EH&S documentation purposes.

How should shellfish chitosan oligosaccharide be stored?

Store in a cool, dry, ventilated location away from direct light and moisture, in tightly sealed packaging to preserve solubility and purity.

Does Chitosan Global ship internationally?

Yes. We ship worldwide. Contact us before placing an order outside the USA for current shipping rates and delivery timelines.

Can chitosan oligosaccharide be used in food products?

Yes, subject to applicable regulatory limits in your market; Food Grade COS is used as a natural dietary fiber, prebiotic, and preservative additive in functional foods and supplements.

Is shellfish chitosan oligosaccharide suitable for vegan formulations?

No. Because it is derived from shrimp and crab shells, shellfish COS is not suitable for vegan or shellfish-allergen-free formulations; our mushroom-derived chitosan oligosaccharide is the appropriate alternative for those use cases.

How does shellfish COS compare to glucosamine?

Chitosan oligosaccharide and glucosamine are both derived from similar marine feedstocks and are increasingly studied together for joint-health and inflammation-management applications, though they differ in molecular structure and primary mechanism of action.

How do I request a custom specification or bulk quote?

Contact our team directly at steve@chitosanglobal.com with your target application, required specification ranges, and volume needs for a custom quote.

Request Your Sample, COA, or Bulk Quote

Ready to evaluate Shellfish Chitosan Oligosaccharide in your formulation, feed program, or research project? Request a free 25 g sample, download the Certificate of Analysis, or contact our team directly at steve@chitosanglobal.com for bulk pricing, custom specifications, and international shipping options. Our technical team is ready to help you select the right chitosan derivative and grade. Food or Industrial or any product across our chitosan derivatives supplier line — for your exact application.