HUMAN NUTRITION

Detailed explanation-1: -1.4 Chitin/chitosan. Chitin is the main structural amino polysaccharide found in the exoskeleton of invertebrates, crustaceans, and insects [90, 91]. Chitosan, a natural poly-N-acetyl-glucosamine, is derived from chitin via alkaline deacetylation [91].

Detailed explanation-2: -Chitin is a modified polysaccharide that contains nitrogen; it is synthesized from units of N-acetyl-D-glucosamine (to be precise, 2-(acetylamino)-2-deoxy-D-glucose). These units form covalent -(1→4)-linkages (like the linkages between glucose units forming cellulose).

Detailed explanation-3: -Chitin is a well-known and one of the most common animal polysaccharides abundantly present in nature. It is obtained from the exoskeletons of insects and crustaceans. The common source of chitin is crab shells. The shells of the crabs are mainly formed by high amount of calcium and rigid chitin network [158].

Detailed explanation-4: -3 Chitin. Chitin is the second most abundant polysaccharide in nature, and is commonly found in lower organisms such as fungi, crustaceans, and insects, but not in mammals.