Technology hub
Chitosan is a natural, biodegradable polymer whose performance is governed by two numbers: degree of deacetylation and molecular weight. This is the ECS entity hub for the material: what it is, how to read its spec, and the water-treatment, packaging-film, food-coating and wound-care applications that each grade serves. ECS sources chitosan in partnership with Chitosan Global and other qualified producers.
- Degree of deacetylation
- Molecular weight / viscosity
- Shellfish or fungal source
- Food / technical / pharma grade
Sourced through the ECS network, including our partner Chitosan Global, on a controlled specification you can compare.
In this pillar
Start here
What chitosan is, in one paragraph.
Chitosan is a biopolymer made by deacetylating chitin, the tough structural polymer found in the shells of crabs, shrimp and other crustaceans, and in the cell walls of fungi. Deacetylation chemically strips acetyl groups off the chitin chain and exposes amino groups. Those amino groups pick up a positive charge in mildly acidic water, and that positive charge is the source of nearly everything chitosan does: it binds to negatively charged particles and microbes, it forms films, and it coagulates suspended solids.
Chitosan is natural, biodegradable, and, in the right grade, safe for food and medical use. It is one of the most abundant biopolymers on earth, and it is renewable when its feedstock is a byproduct of the seafood or fermentation industries. Those properties put it at the center of two ECS solution areas at once: water treatment, where it removes suspended solids and helps capture micro- and nanoplastics, and compostable packaging, where it forms biodegradable and even edible films.
Because chitosan is a partner-sourced material rather than a displacement target, this hub is purely educational and sourcing-focused. ECS works with Chitosan Global and other producers to match the grade to the application; the value ECS adds is the spec literacy and the controlled sourcing that turn “chitosan” into a comparable, fit-for-purpose order.
Chitosan at a glance
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Specs that govern performance: degree of deacetylation and molecular weight.
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The positive charge from exposed amino groups drives flocculation, film-forming and antimicrobial action.
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Core applications: water treatment, biodegradable film, food coating, wound care.
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Sources: shellfish (conventional) and fungal (vegan, no shellfish allergen).
Read the spec sheet
Two numbers decide whether a grade fits.
Most chitosan disappointment comes from ordering “chitosan” instead of a grade. Degree of deacetylation and molecular weight govern solubility, charge and strength; everything else is secondary.
| Spec parameter | Water flocculation | Biodegradable film | Food coating | Wound / biomedical |
|---|---|---|---|---|
| Degree of deacetylation (DDA) | High (more charge) | Mid to high | Mid to high | High, tightly controlled |
| Molecular weight | Mid (bridging) | High (film strength) | Mid to high | Controlled |
| Viscosity (proxy for MW) | Required | Required | Required | Required |
| Source (shellfish / fungal) | Either | Either | Allergen-driven | Often fungal / purified |
| Grade (tech / food / pharma) | Technical | Technical / food | Food | Pharmaceutical |
| Per-lot certificate of analysis | Required | Required | Required | Required |
What it is used for
Four applications, four grades.
The positive charge that makes chitosan useful expresses differently in each application. Pick the application, name the DDA and molecular weight, and ECS matches the grade.
Use 1
Water and wastewater flocculation
A natural coagulant that binds negatively charged suspended solids, including fine particulates and a fraction of micro- and nanoplastics, so they settle and filter out. A renewable alternative to synthetic polyacrylamide coagulants.
- High DDA for charge density
- Molecular weight tuned for floc bridging
- Jar-test the actual water before scaling
Use 2
Biodegradable and edible film
Cast or coated into a transparent, biodegradable film with inherent antimicrobial activity. Used in compostable packaging and as an edible barrier coating, often blended with other biopolymers.
- High molecular weight for film strength
- Food grade where the film contacts food
- Plasticizer and blend compatibility
Use 3
Food coating and preservation
An edible antimicrobial coating that extends the shelf life of fresh produce by slowing moisture loss and microbial growth. Requires a food grade and, depending on market, a shellfish-allergen-free fungal source.
- Food grade and FDA GRAS basis
- Source chosen for allergen labeling
- Solution viscosity for even coating
Use 4
Wound care and biomedical
Used in hemostatic dressings and biomedical scaffolds, where chitosan’s antimicrobial and tissue-friendly behavior is valuable. The most tightly controlled grade, demanding pharmaceutical specification and purity.
- Pharmaceutical grade and purity
- Tightly controlled DDA and molecular weight
- Endotoxin and contaminant limits
What the grade has to prove
Certifications and quality documentation.
Chitosan spans technical, food and pharmaceutical grades, and the documentation rises with the grade. Match the certification to the application, and require the per-lot certificate of analysis regardless of grade.
FDA GRAS
Food and coating use
Generally Recognized As Safe basis for food-contact coatings and additives. Confirms the safe-use foundation for edible films and produce coatings; pair it with the food-grade certificate of analysis.
Certificate of analysis
Per lot
The per-lot document that reports the actual DDA, molecular weight or viscosity, moisture, ash and impurity results. The single most important piece of paper in a chitosan order.
Source traceability
Shellfish / fungal
Documentation of feedstock origin. Required for allergen labeling, for vegan claims on fungal grades, and for sustainability claims tied to byproduct feedstocks.
Pharmaceutical grade
Biomedical use
For wound and biomedical applications, the grade and purity documentation appropriate to the regulatory pathway, including controlled DDA, molecular weight and endotoxin limits.
Biodegradability data
Packaging claims
For film and packaging use, the breakdown evidence that supports a biodegradable or compostable claim, against the relevant standard for the disposal environment.
Heavy-metal limits
All food / medical grades
Contaminant ceilings appropriate to the grade. Always specified for food, cosmetic and medical chitosan, and reported on the certificate of analysis.
ECS sources chitosan against the documentation the application requires and verifies the per-lot certificate of analysis on every order. The two performance numbers, degree of deacetylation and molecular weight, are written into the spec so suppliers, including our partner Chitosan Global, return comparable, fit-for-purpose grades.
Partnership
ECS x Chitosan Global.
Chitosan Global is an ECS distribution partner and an industrial-scale chitosan producer for water, film and biomedical applications. ECS presents and sources their chitosan grades alongside the spec literacy and controlled RFQ that buyers need, so the partnership delivers both supply and the buyer-guide layer in one place.
- Industrial-scale chitosan supply across water-treatment, film and biomedical grades.
- ECS adds the DDA and molecular-weight spec literacy buyers need to order the right grade.
- Per-lot certificate of analysis verified on every order, technical through pharmaceutical.
- One controlled RFQ that returns comparable, fit-for-purpose grades.
Ready for real numbers
Source chitosan on the grade your application needs.
Tell us the application, target degree of deacetylation, molecular weight or viscosity, source preference, grade and volume. We match it across the ECS network, including Chitosan Global, and return a comparable, documented bid.
Go deeper
Chitosan guides and solution pillars.
This hub gathers the ECS chitosan cluster: the flocculation science, the packaging-film application, and the solution pillars where chitosan does its work.
Water science
Chitosan flocculation explained
How charge and molecular weight drive coagulation, and chitosan vs alginate and synthetic coagulants.
Packaging
Chitosan film for packaging
Film-forming, edible coatings and biopolymer blends for compostable packaging.
Pillar
Micro-plastic removal
Where chitosan flocculation pairs with biochar filtration in the ECS brand thesis.
Pillar
Water treatment
PFAS, heavy metals and suspended solids, with chitosan in the coagulation stage.
Pillar
Compostable packaging
The biopolymer film context for chitosan-based and chitosan-blend packaging.
Partner catalog
ECS x Chitosan Global
The partner distribution page with the chitosan product range, organized by application.
Buyer questions
Chitosan FAQ.
What is chitosan?
Chitosan is a natural biopolymer made by deacetylating chitin, the structural polymer found in the shells of crustaceans and the cell walls of fungi. The deacetylation exposes amino groups that carry a positive charge in mild acid, which is what gives chitosan its antimicrobial, film-forming and flocculation behavior. It is biodegradable and, in food and medical grades, recognized as safe for its intended use.
What does degree of deacetylation mean for chitosan?
Degree of deacetylation (DDA) is the percentage of the polymer’s units that have been converted from chitin to chitosan, exposing the reactive amino groups. Higher DDA means more positive charge, stronger antimicrobial and flocculation behavior, and lower solubility at neutral pH. DDA and molecular weight are the two specifications that most determine how a chitosan grade performs, so both belong in any spec.
Is chitosan vegan, and what is fungal chitosan?
Conventional chitosan is made from shellfish shells, so it is not vegan and carries a shellfish allergen consideration. Fungal chitosan is produced from fungal cell walls instead, which removes the shellfish allergen and gives a vegan, traceable source. Fungal grades can carry a price premium and a different impurity profile; choose the source based on the allergen, regulatory and cost constraints of the end use.
What is chitosan used for?
Chitosan is used as a natural coagulant and flocculant in water and wastewater treatment, as a biodegradable and edible film for packaging and food coating, as an antimicrobial agent, and in wound dressings and biomedical applications. Each use pulls on a different grade: water treatment favors a specific molecular weight and charge, while film and coating favor film-forming and food-grade specifications.
How is chitosan specified for sourcing?
Specify degree of deacetylation, molecular weight (or viscosity as a proxy), source (shellfish or fungal), grade (technical, food or pharmaceutical), particle size or solution form, and any required certifications such as FDA GRAS for food use. A chitosan order without DDA and molecular weight is incomparable across suppliers, because those two numbers govern performance.
Start a spec-controlled RFQ
Tell us your chitosan grade. We source it on spec.
Submit your application, target degree of deacetylation, molecular weight or viscosity, source preference and volume. Our sourcing desk matches it across the ECS network, including Chitosan Global, and returns a documented, comparable bid.
- Spec written around the two numbers that matter: DDA and molecular weight.
- Source matched to your allergen and vegan-labeling constraints.
- Per-lot certificate of analysis verified on every order.
- Grade matched to the application, technical through pharmaceutical.