Chitin

Chitin is one of the most important biopolymers in nature. It is a substance that gives strength to the cellular walls of fungus, insects, and crustaceans as well as their exoskeletons. Chitin is the second most abundant biopolymer in the world after cellulose. Chitin has characteristics similar as keratin. It is a polysaccharide made up of units of the glucosamine amino sugar. The primary natural sources of chitin are the shells of shrimp and crab, which are a plentiful byproduct of the food processing industry and a major supply of this biopolymer for biomedical applications.
PROPERTIES:-
High porosity
biodegradability
predictable breakdown rate
structural integrity