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Chitosan's chemical formula is (C6H11NO4)n​​. Derived from chitin by partial deacetylation, it comprises units of glucosamine and N-acetylglucosamine.
Chitosan consists in β-(1→4)-linked D-glucosamine and N-acetyl-D-glucosamine units in a linear polysaccharide form. Its biocompatibility and biodegradability help to explain why it finds utility in many different fields.
The melting point of chitosan can range from 102.5°C to 216.69°C, depending on the form and preparation of the chitosan.
The molecular weight of chitosan can vary depending on its type, and is typically between 3,800 and 20,000 daltons.
Higher degrees of deacetylation raise solubility, reactivity, and bioactivity of chitosan. Its biocompatibility improves as well, which increases its value in both industrial and medical spheres.