Generally speaking, chitin mainly refers to chitosan, which is also called chitin, deacetylated chitin, deacetylated chitin, soluble chitin and soluble chitin. Amorphous solid, specific optical rotation [α] D11—3°～+10°. Almost insoluble in water, but soluble in organic acids such as formic acid, acetic acid, benzoic acid and naphthenic acid and dilute inorganic acids. The industrial product is a white or off-white translucent flaky solid with a slight pearl luster. Odorless, non-toxic and easily degradable, it is a rare natural cationic polyelectrolyte. The polysaccharide obtained by removing the acetyl group on the chitin sugar group by strong alkaline hydrolysis or enzymatic cleavage. It is soluble in low acidity aqueous solution, has good biocompatibility, has no antigenicity, and is insoluble in human body fluids. It is obtained from the lower animals and plants that widely exist in nature, such as chitin in the shells of arthropods (shrimp, crab), and deacetylation by adding alkali and heating.

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