Chitosan Hydrochloride: Why Industries Rely on This Water-Soluble Biopolymer
- All
- Microplastics
- Water Soluble
- All
- Native Chitosan
- Black Soldier Fly Chitosan
- Chitosan Oligosaccharide Hydrochloride
- Chitosan Oligosaccharide
- Chitosan Hydrochloride
- Carboxymethyl Chitosan
- Quaternary Chitosan
- Trimethyl Chitosan
- Sulphonated Chitosan
- Phosphorylated Chitosan
- Biochar
- Home Cleaning System
Shellfish chitosan hydrochloride is the water-soluble salt form of chitosan produced from shrimp and crab shell chitin (CAS 70694-72-3). The amine groups along the polymer backbone are pre-protonated with hydrochloric acid during manufacturing, so the material dissolves directly in neutral water – no separate acid-preparation step. That makes it the most formulation-friendly form of shellfish chitosan: the traditional chitosan source’s cost and supply advantages, delivered in a form usable in neutral-pH systems. Specifications run DDA ≥85%, molecular weight 50,000-100,000 Da, off-white to cream powder, with batch-specific documentation on the product page.
What Is Shellfish Chitosan Hydrochloride?
Native shellfish chitosan has a formulation constraint: it only dissolves in acidic solution. Below roughly pH 6, its amine groups protonate and the polymer goes into solution; above that, it stays undissolved. For a formulator whose system must stay at or near neutral pH – a clear cosmetic serum, a buffered pharmaceutical vehicle, a neutral beverage – that constraint can rule the material out entirely.
Shellfish chitosan hydrochloride exists to solve exactly this problem, on the industry’s most established raw-material base. It is chitosan derived from shrimp and crab shell chitin that has already been converted into its hydrochloride salt: the amine groups are pre-protonated during manufacturing, so the powder dissolves directly in water without the formulator introducing and managing a separate acid.
It is still fundamentally chitosan – the same glucosamine backbone, the same cationic charge behavior in solution – delivered in the form the widest range of formulations can actually use. And because the underlying source is crustacean shell waste, it carries the advantages that have made shellfish chitosan the industry standard: abundant raw material, decades of commercial track record, and the lowest cost structure in the chitosan family.
Product Identity: CAS Number and Core Specifications
The material is a defined chemical entity, not just a marketing category:
| Identity | Value |
|---|---|
| Product name | Chitosan Hydrochloride (Chitosan HCl) |
| CAS Number | 70694-72-3 |
| Biological source | Shellfish – shrimp and crab |
| Degree of deacetylation (DDA) | ≥85% (batch result confirmed on the current COA) |
| Molecular weight | 50,000-100,000 Da |
| Appearance | Off-white to cream fine powder |
| Solubility | Water-soluble salt form |
Current batch values, the Certificate of Analysis, and sample options are published on the product page.
Shellfish HCl vs Mushroom Chitosan Hydrochloride
The salt chemistry is identical – the same pre-protonation, the same CAS number, the same water-soluble behavior. The difference is the source underneath: shellfish HCl is produced from shrimp and crab shell chitin (the traditional, cost-efficient base), while mushroom chitosan hydrochloride is produced from fungal chitin (the vegan-compatible, allergen-free path). Same chemistry, different sourcing and documentation profiles – which one fits depends on your labeling and market requirements, covered in the allergen section below.
Why the Hydrochloride Salt Form Matters to Formulators
The problem this section solves: understanding whether the salt conversion is real chemistry worth paying for – because that decides whether it belongs in your process.
Native chitosan’s solubility limit comes down to charge. Chitosan is a weak base with a pKa around 6.5; research indicates it becomes soluble once roughly half of its amine groups are protonated. Above pH 6-6.5, insufficient protonation occurs, hydrogen bonding between polymer chains dominates, and the material stays essentially undissolved in neutral water. Converting chitosan to its hydrochloride salt addresses this at the manufacturing stage instead of the formulation stage.
Three practical consequences follow:
- No acid-preparation step – the formulator skips selecting, adding, and validating an acidifying agent; fewer variables to control and document
- Lower viscosity at equivalent concentration – research comparing chitosan salt forms has found HCl-acidified solutions exhibit measurably lower viscosity than equivalent acetic-acid solutions, useful for sprayable and pumpable systems
- Access to pH-neutral formulation space – systems carrying acid-sensitive actives, or requiring a neutral sensory profile, become practical
The honest tradeoff: some research has flagged that residual chloride ions can raise toxicity considerations in specific biomedical contexts – worth discussing with your technical team for sensitive applications rather than assuming it is automatically a non-issue. Peer-reviewed background on the polymer’s behavior: the stability review (PMC4413189) and the chitosan/chitosan chlorhydrate matrix study (PMC3556008).
How Is Shellfish Chitosan Hydrochloride Produced?
The production logic runs in two stages: make chitosan from shell waste, then convert it to the salt.
- Chitin isolation – shrimp and crab shell waste is demineralized (acid) and deproteinized (alkali) to isolate purified chitin
- Deacetylation – concentrated alkali under heat converts chitin into chitosan, the step that sets DDA
- Salt conversion – the chitosan reacts with hydrochloric acid, pre-protonating the amine groups to form the hydrochloride salt
- Purification, drying, milling – the salt is purified, dried, and processed into an off-white to cream fine powder
- Batch characterization – DDA, molecular weight, viscosity, moisture, and purity are tested and documented on the batch Certificate of Analysis
Both the starting chitosan and the conversion conditions shape the final product: polymer-chain length, deacetylation, viscosity, residual mineral content, and solution behavior all carry process dependence. Excessive acid exposure or extended processing can contribute to polymer-chain degradation – which is why controlled production and batch characterization matter when consistent molecular weight is required. The full process detail: how chitosan hydrochloride is manufactured, and the upstream extraction sequence in our shellfish chitosan extraction guide.
Specifications That Define Shellfish Chitosan Hydrochloride Quality
The problem this section solves: “chitosan HCl” labels hide wide specification spread – the salt form does not fix the molecular-weight question, and two suppliers’ materials can differ substantially. What matters is the batch document, not the category.
| Parameter | Specification / typical | Notes for buyers |
|---|---|---|
| CAS Number | 70694-72-3 | Hydrochloride salt form of chitosan |
| DDA | ≥85% | Batch result confirmed on the current COA before commercial qualification |
| Molecular weight | 50,000-100,000 Da | Confirm the required range before ordering – it drives viscosity and film behavior |
| Appearance | Off-white to cream fine powder | May vary slightly by batch |
| Solubility | Water-soluble salt form | Actual solution behavior depends on concentration, pH, and formulation conditions |
| Viscosity | Grade and batch dependent | Measured on 1% solution at 25°C – request the current batch value |
| Moisture / ash | Per batch COA | Confirm before regulated or commercial use |
| Documentation | COA and SDS available on request | Use the applicable batch-specific documents |
Current values and the batch COA are published on the product page – always qualify against the batch you will actually receive, not a category description. Background on how these specifications interact: Chitosan: Sources, Processing and Modification Techniques (PMC9322947).
The Five Variables That Still Shape Solution Behavior
The salt form removes the acid step – it does not remove formulation variables. Solution behavior still depends on: polymer concentration, molecular-weight distribution, DDA, hydration time and mixing, and the ionic environment (salts, proteins, surfactants, and other charged ingredients can all interact with the cationic polymer). Water solubility is a starting capability, not a guarantee of performance in every formulation without verification – trial the batch under your real conditions.
Shellfish Chitosan Hydrochloride vs Native Chitosan
The problem this table solves: deciding whether the salt form belongs in your process – or whether native chitosan with your existing acid step does the same job for less.
| Formulation consideration | Native shellfish chitosan | Shellfish chitosan hydrochloride |
|---|---|---|
| Separate acid preparation | Normally required | Generally not required for initial aqueous preparation |
| Process already designed around acid | May be suitable | May add unnecessary cost or complexity |
| Direct water-based preparation | More difficult | Usually more convenient |
| Final solution behavior | Depends on acid, pH, and grade | Depends on concentration, grade, and formulation matrix |
| Best purchasing decision | When acid processing is acceptable | When simplified aqueous processing is important |
For the full decision framework including specification ranges and acid-sensitive actives: chitosan hydrochloride vs native chitosan. If your process already uses a compatible acidic phase, native shellfish chitosan may remain the practical option.
Where Shellfish Chitosan Hydrochloride Sits in the Chitosan Family
Chitosan hydrochloride is one of several water-compatible forms – seeing the family prevents the wrong purchase:
- Native chitosan – unmodified; acid-soluble only
- Chitosan hydrochloride – pre-protonated salt; water-soluble without added acid; this material
- Chitosan oligosaccharide – much shorter chains, low viscosity; for fast dispersion rather than film-forming behavior
- Carboxymethyl chitosan – broader pH solubility including alkaline conditions
- Quaternary / trimethyl chitosan – permanently charged, retaining cationic behavior at higher pH
Simple water solubility near neutral pH points toward chitosan HCl; other constraints point toward the alternatives – the full comparison: types of chitosan.
Applications of Shellfish Chitosan Hydrochloride by Industry
Drug delivery and pharmaceutical research – water solubility makes it practical for aqueous delivery work: mucoadhesive systems, nanoparticles and microparticles, hydrogels, and controlled-release matrices, where avoiding an acidification step simplifies development. Focused review: chitosan hydrochloride for drug delivery; the documentation set regulated applications expect is on our pharmaceutical-grade mushroom chitosan page (the same standards apply to any source).
Water and wastewater treatment – a readily soluble cationic polymer for coagulation, flocculation, dye removal, and metal-ion interaction research, with dosage established by jar test on the actual water stream. Focused guidance: chitosan hydrochloride for water treatment.
Cosmetics and personal care – water-based serums, hair conditioners, and cationic polymer systems where native chitosan’s acid dependency would conflict with target pH. Background: chitosan in cosmetics.
Agriculture – foliar formulations, seed treatments, and sprayable crop inputs that dissolve without acid pre-treatment. Background: chitosan for agriculture.
Food, coating, and packaging research – edible films, protective coatings, and preservation research, subject to grade and regulatory requirements. Background: chitosan in the food industry.
Peer-reviewed background on chitosan sources and processing: Chitosan: Sources, Processing and Modification Techniques (PMC9322947).
Is Shellfish Chitosan Hydrochloride Vegan? Allergen Facts
No – and this is the clearest line in the comparison. Because the starting material is crustacean-derived chitin (shrimp and crab), this material is not vegan, not shellfish-free, and should not be labeled as either. Depending on the application and market, qualification may require a source declaration, allergen documentation, cross-contact controls, and country-of-origin review – a general purity statement does not replace application-specific allergen or regulatory evaluation.
If those constraints apply to your project, the solution is sourcing, not processing: mushroom chitosan hydrochloride delivers the same water-soluble salt chemistry from fungal chitin – no shellfish allergen concern, vegan-compatible – and the source trade-off is weighed in shellfish chitosan vs mushroom chitosan.
What to Check Before Buying Shellfish Chitosan Hydrochloride
Before ordering, confirm against current documentation rather than assuming standard values:
- Source – shrimp/crab origin, documented; relevant to allergen and labeling decisions
- DDA – the batch value (specification: ≥85%)
- Molecular weight – the batch range (specification: 50,000-100,000 Da); confirm it matches your viscosity needs
- Viscosity – at a stated concentration and temperature
- Purity – moisture, ash, and residual content per the batch COA
- Solubility – confirmed water-soluble behavior under your conditions
- pH – of the reconstituted solution at your intended concentration (do not assume values from a different source’s COA)
- Documentation – batch-specific COA, product-specific SDS, allergen statement
- Quantity path – 25 g sample, 1 kg standard, bulk with lead times confirmed
Specifications, pack sizes, and the batch COA are published on the product page – request a laboratory sample there, or contact our technical team with your application requirements. For supplier qualification criteria: shellfish chitosan hydrochloride supplier. For ordering paths: buy shellfish chitosan hydrochloride.
Frequently Asked Questions
What is shellfish chitosan hydrochloride?
The hydrochloride salt form of chitosan derived from shrimp and crab shell chitin – pre-protonated during manufacturing so it dissolves directly in water, developed for easier incorporation into aqueous formulations than native shellfish chitosan.
Is shellfish chitosan hydrochloride water soluble?
Yes – it is supplied as a water-soluble salt form and dissolves without an added acid. Actual solution behavior still depends on concentration, molecular weight, pH, temperature, and other formulation ingredients.
What is the CAS number of chitosan hydrochloride?
70694-72-3 – the hydrochloride salt form of chitosan, shared across sources; the sourcing difference is the biological origin underneath.
What DDA and molecular weight does this grade have?
The specification lists DDA ≥85% and molecular weight 50,000-100,000 Da – the exact batch values are confirmed on the current Certificate of Analysis, viewable on the product page.
Is this product shellfish-free?
No. It is derived from shrimp and crab shell chitin and should not be described or labeled as shellfish-free. For a shellfish-free water-soluble form, mushroom chitosan hydrochloride is the appropriate material.
How is it different from native shellfish chitosan?
Native shellfish chitosan normally requires dilute acidic conditions for dissolution; the hydrochloride salt arrives pre-protonated, so aqueous preparation is direct – removing the acid-preparation step and its variables.
Which applications suit shellfish chitosan hydrochloride?
Aqueous systems across drug-delivery research, cosmetics, food formats, agricultural sprays, and water treatment – anywhere cationic chitosan behavior is needed without an acid-preparation step, at the traditional source’s cost level.
Can I request a sample before placing a bulk order?
Yes. A 25 g laboratory sample and a 1 kg standard pack are available for preliminary evaluation before a commercial-volume purchase – see the product page for options and documentation.
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- Black Soldier Fly Chitosan
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- Chitosan Oligosaccharide
- Chitosan Hydrochloride
- Carboxymethyl Chitosan
- Quaternary Chitosan
- Trimethyl Chitosan
- Sulphonated Chitosan
- Phosphorylated Chitosan
- Biochar
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Get in Touch
Technical & Custom Solutions
Abhinav Chauhan, PhD – Application Scientist
Stephen Nice – Application Scientist