Introduction of Chitosan as Nano-drug Delivery Carrier
Chitin is the second largest natural polymer after cellulose, and it exists widely in nature, such as shells of crustaceans such as shrimps, crabs, insects, and cell walls of fungi. Although chitin has good biocompatibility and biodegradability, its poor solubility limits its practicality in the field of biomedicine. The product of chitin deacetylation is chitosan . Chitosan is structurally composed of D-glucosamine units, and each repeating glycoside unit has an amino group