Original Title: Carboxymethyl Chitosan, a film-forming, moisturizing and anti-pollution active ingredient CARBOXYMETHYL CHITOSAN is a polysaccharide derived from marine organisms. Its molecular structure is as follows: Beta-1-4-straight chain glucose derivatives Disordered geometric arrangement of diglucose molecular Effective hydrophilic groups: carboxyl, acetamido Effective anti-corrosion...