The structural details of cellulose, chitin and chitosan are shown in Fig. 1. Cellulose is a homopolymer, while chitin and chitosan are heteropolymers. Neither random nor block orientation is meant to be implied for chitin and chitosan. The properties of chitin and chitosan such as the origin of the material (discussed in the previous section), the degree of N-deacetylation, molecular weight and solvent and solution tion, molecular weight and solvent and solution tion, molecular weight and solvent and solution first derivative of practical importance; other derivatives and their proposed uses are shown in