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Chitin is a kind of natural polysaccharide, which mainly comes from the shell of crustaceans such as shrimp and crabs and the cell wall of fungi.
Chitin is a long chain polymer that is polymerized from N-acetylglucosamine, a derivative of glucose, as a monomer. Its scientific name is (1,4) -2-acetamido-2-deoxy-β-d-glucose, and its molecular formula is (C8H13NO5) N.
Chitin is a off white powder, insoluble in water, dilute acid, lye and usual organic solvents, but soluble in concentrated inorganic acid and degradation occurs at the same time. In nature, it is a translucent, flexible, flexible, and very tough substance.
Chitin contains -NH2 group and -OH group, which is easy to undergo a variety of chemical reactions and can generate a variety of derivatives with different properties, among which the most important derivative is chitosan.