At present, increasing interest is being devoted to the use of natural substances such as bioactive chitosan polymers. Chitosan is a linear amino polysaccharide of glucosamine and N-acetylglucosamine units and is obtained by alkaline deacetylation of chitin extracted from the exoskeleton of crustaceans such as shrimps and crabs, as well from the cell walls of some fungi ( No and Meyers, 1997). Chitosan has become a promising alternative treatment for fruit and vegetables due to its natural character, antimicrobial activity, and elicitation of defense responses in plant tissue ( Terry and Joyce, 2004 and Fisk et al., 2008). Indeed, chitosan is an ideal preservative coating for fresh fruit and vegetables because of its film-forming and biochemical properties ( Muzzarelli, 1986) and has led to prolonged storage life and controlled decay of several fruit crops (Romanazzi et al., 2002).