HUMAN NUTRITION

Detailed explanation-1: -Chitin, the second most abundant natural polysaccharide, after cellulose, is a linear polymer composed of repeating (1, 4)-N-acetylglucosamine units (Figure 18). Chitin exists in the shells of arthropods such as crabs, shrimps, and insects and is also produced by fungi and bacteria.

Detailed explanation-2: -Chitin, a (1, 4)-linked homopolymer of N-acetylglucosamine, is a simple polysaccharide that is represented in the cell walls of all fungi studied to date [1, 2].

Detailed explanation-3: -Chitin is a linear homopolysaccharide composed of N-acetyl-D-glucosamine residues in -linkage. The only chemical difference from cellulose is the replacement of a hydroxyl group at C-2 with an acetylated amino group.