A polysaccharide derivative of chitin, chitosan is derived from the shells of marine animals like lobsters, crabs, and prawns. Chitin, which is obtained from leftover crustacean shells, is deacetylated to create commercial chitosan. Chitosan is a common ingredient in dietary supplements because it limits the absorption of lipids in the gastrointestinal tract. Because of its biocompatibility and biodegradability, it is frequently employed in medical applications. Chitosan is a good choice for hemostatic dressing because of its anticoagulant characteristics. Also, it is employed in agriculture as a biopesticide to prevent pathogenic effects on trees and plant growth as well as for water purification. Moreover, it is utilised as a food preservative, in polyurethane paints and coatings, and in the bioprinting of organs.

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