Carboxymethyl Chitosan (CAS 83512-85-0): Complete Guide to This Versatile Biopolymer
What is Carboxymethyl Chitosan?
Carboxymethyl chitosan (CAS 83512-85-0) is a chemically modified derivative of chitosan, obtained through carboxymethylation of chitosan’s hydroxyl and amino groups. This modification significantly improves the water solubility of chitosan while preserving its valuable biological properties.
Chitosan itself is derived from chitin, which is found in the exoskeletons of crustaceans like shrimp and crabs. The carboxymethylation process adds carboxymethyl groups (-CH2COOH) to the chitosan polymer chain, creating a compound with enhanced solubility across a wider pH range compared to native chitosan.
This modification makes carboxymethyl chitosan (CMCS) soluble in both acidic and alkaline conditions, expanding its applications significantly. The degree of carboxymethylation can be controlled to produce different variants including N-CMCS, O-CMCS, N,O-CMCS, and N,N-CMCS, each with unique properties.
Key Benefits of Carboxymethyl Chitosan
Excellent Water Solubility
Unlike regular chitosan, which is only soluble in acidic conditions, carboxymethyl chitosan dissolves readily in neutral and alkaline pH environments. This expanded solubility range makes it far more versatile for industrial and pharmaceutical applications.
Biocompatibility and Biodegradability
Carboxymethyl chitosan inherits the excellent biocompatibility and biodegradability of its parent compound chitosan. It breaks down naturally in the body into non-toxic components, making it ideal for medical and pharmaceutical applications.
Low Toxicity
Studies have demonstrated that carboxymethyl chitosan has low toxicity, making it safe for use in food, pharmaceutical, and cosmetic applications. This safety profile has been confirmed through numerous toxicological studies.
Film-Forming and Gel-Forming Capabilities
Carboxymethyl chitosan can form films, fibers, and hydrogels with excellent mechanical properties. These materials are useful in wound dressings, drug delivery systems, and tissue engineering scaffolds.
High Viscosity and Hydrodynamic Volume
The polymer exhibits high viscosity in solution, making it useful as a thickening agent and stabilizer in various formulations.
Metal Chelation Properties
Carboxymethyl chitosan serves as an efficient metal chelator with high adsorption capacities for heavy metals like mercury, making it valuable for environmental remediation applications.
Dye Adsorption
The compound demonstrates excellent adsorption properties for dyes, useful in wastewater treatment and textile industry applications.
Applications and Uses
Pharmaceutical and Drug Delivery
- Sustained Release Drug Delivery: Used as a carrier matrix for controlled release of pharmaceutical compounds
- pH-Responsive Drug Delivery: Its pH-sensitive properties enable targeted drug release
- Gene Delivery: Functions as a permeation enhancer for genetic material
- Tissue Engineering: Supports cell growth and tissue regeneration
Wound Healing and Medical Devices
- Hydrogel wound dressings that promote healing
- Surgical sutures and tissue adhesives
- Anti-adhesive membranes
- Hemostatic agents
Cosmetic and Personal Care
- Skin Care: Forms protective barriers to prevent moisture loss, similar to hyaluronic acid
- Hair Care: Improves hair conditioning and protection
- Oral Care: Functions as anti-plaque component in toothpastes and mouthwashes
- Moisturizers and Anti-aging Products: Provides excellent hydration properties
Food Industry
- Edible coatings for fruits and vegetables
- Food packaging materials
- Nutrient delivery systems
- Food preservation
Environmental Applications
- Heavy metal removal from wastewater
- Dye adsorption in textile industry
- Water purification
- Biodegradable packaging alternatives
Agriculture
- Plant protection and growth promotion
- Soil conditioner
- Controlled release of fertilizers and pesticides
Safety and Side Effects
General Safety Profile
Carboxymethyl chitosan is generally recognized as safe (GRAS) for many applications. Its low toxicity and excellent biocompatibility make it suitable for pharmaceutical, food, and cosmetic use.
Potential Side Effects
When used in pharmaceutical or cosmetic applications, side effects are rare but may include:
- Mild skin irritation in sensitive individuals
- Allergic reactions in people with shellfish allergies (though less likely than with chitosan)
Contraindications
- Known hypersensitivity to chitosan or chitin derivatives
- Individuals with severe shellfish allergies should use with caution
Environmental Safety
Carboxymethyl chitosan is biodegradable and environmentally friendly, breaking down into harmless substances without persistent pollution.
Chemical Specifications
| Property | Value |
| CAS Number | 83512-85-0 |
| Molecular Formula | C20H37N3O14 (varies with degree of substitution) |
| Appearance | White to off-white powder |
| Solubility | Soluble in water (acidic, neutral, and alkaline) |
| Viscosity | High (varies with molecular weight) |
| Biodegradability | Biodegradable |
| Toxicity | Low |
| Biocompatibility | Excellent |
Frequently Asked Questions
How is carboxymethyl chitosan different from regular chitosan?
The main difference is solubility. Regular chitosan only dissolves in acidic conditions (pH below 6.5), while carboxymethyl chitosan dissolves in a much wider pH range including neutral and alkaline conditions. This makes CMCS more versatile for applications where acidic conditions are not suitable.
Is carboxymethyl chitosan safe for sensitive skin?
Yes, carboxymethyl chitosan is generally well-tolerated and is used in many sensitive skin care products. Its film-forming properties can actually help protect sensitive skin by creating a gentle barrier.
Can carboxymethyl chitosan be used in food products?
Yes, carboxymethyl chitosan is approved for food applications in many countries. It is used as a thickening agent, stabilizer, and coating material in various food products.
Is it effective for heavy metal removal?
Absolutely. Carboxymethyl chitosan has excellent chelation properties for heavy metals like mercury, lead, and cadmium, making it valuable for environmental remediation and wastewater treatment.
What is the difference between N-CMCS and O-CMCS?
N-CMCS has carboxymethyl groups attached to the nitrogen atoms, while O-CMCS has them attached to the oxygen atoms of chitosan. N,O-CMCS has substitutions on both. Each variant has slightly different properties and applications.
How should carboxymethyl chitosan be stored?
Store in a cool, dry place away from moisture and direct sunlight. Keep container tightly closed when not in use. Proper storage ensures stability for up to 2-3 years.
Why Choose Our Carboxymethyl Chitosan?
- High Purity – Pharmaceutical and cosmetic grade available
- Consistent Quality – Rigorous quality control testing
- Custom Specifications – Various degrees of substitution available
- Competitive Pricing – Bulk orders welcomed
- Technical Support – Expert guidance on applications
- Reliable Supply – Consistent availability for your business needs
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