Se-Kwon Kim 
Chitin and Chitosan Derivatives [PDF ebook] 
Advances in Drug Discovery and Developments

A natural long-chain polymer, chitin is the main component of the cell walls of fungi, the exoskeletons of arthropods (including crustaceans and insects), the radulas of mollusks, and the beaks and internal shells of cephalopods. However, marine crustacean shells are the primary sources of the chitin derivative chitosan. Chitin and chitosan are use