Overview
Chitosan oligosaccharide (COS) is a hydrolyzed form of chitosan, produced by enzymatic or chemical degradation of chitin, a natural polysaccharide found in crustacean shells. With a low molecular weight (typically 1,000-10,000 Da), COS exhibits improved water solubility and bioactivity compared to its parent polymer. It is widely used in agriculture, medicine, and food industries due to its biocompatibility, biodegradability, and non-toxic nature. Research highlights its role as an elicitor in plants, triggering defense mechanisms against pathogens. In humans, COS shows potential in wound healing, drug delivery, and as a dietary supplement for cholesterol management. Its versatility stems from its cationic nature, which allows interaction with negatively charged surfaces like microbial cell walls.
Physical and Chemical Properties
Chitosan oligosaccharide appears as a white to light yellow hygroscopic powder, soluble in water and acidic solutions (pH <6.5). Its solubility is a key advantage over chitosan, which requires acidic conditions to dissolve. COS is stable at room temperature but may degrade under prolonged exposure to high temperatures or strong oxidizers. The degree of polymerization (DP) and deacetylation (DD) significantly influence its properties. For instance, lower DP (2-20) enhances absorption in biological systems, while higher DD (>85%) increases cationic charge density, improving antimicrobial efficacy. COS is also known for its chelating ability, binding heavy metals like lead and cadmium, which is exploited in water treatment and detoxification applications.
Main Applications
In agriculture, COS is a potent biostimulant, boosting crop yield and resistance to diseases like powdery mildew. It activates plant innate immunity by inducing the production of phytoalexins and reactive oxygen species. Farmers apply it as a foliar spray or soil amendment at 50-200 ppm concentrations. The pharmaceutical industry leverages COS for its wound-healing properties, attributed to its ability to accelerate fibroblast proliferation and collagen synthesis. It’s also used in nanoparticle drug delivery systems due to its mucoadhesive properties. In food preservation, COS extends shelf life by inhibiting spoilage bacteria like E. coli and S. aureus, often as a coating for fruits or edible films.
Safety and Storage
Chitosan oligosaccharide is classified as Generally Recognized as Safe (GRAS) by the FDA for food applications. Oral LD50 values in rodents exceed 5,000 mg/kg, indicating low acute toxicity. However, dust inhalation during handling may cause respiratory irritation; using PPE like masks is recommended. Storage requires protection from moisture to prevent caking. Ideal conditions include airtight containers in a dry environment below 25°C. Bulk quantities should be palletized away from direct sunlight. COS solutions are stable for weeks at pH 4-6 but may hydrolyze in strongly acidic or alkaline conditions.
B2B Procurement Guide
When sourcing COS, prioritize suppliers who provide certificates of analysis (CoA) detailing molecular weight distribution (e.g., 80% within 1,000-3,000 Da), deacetylation degree (≥90%), and residual ash content (<1%). For agricultural use, opt for water-soluble formulations with low viscosity. Pricing varies by scale; bulk orders (≥1 ton) often cost 20-30% less per kilogram. Major producers are located in China, India, and Norway. Sample testing is advised to confirm compatibility with end-use processes, especially for pharmaceutical-grade COS, where endotoxin levels must be <0.5 EU/mg.
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