Chitosan(CTS),a linear binary copolymer of(1→8)-linked 2-acetamido-2-deoxy-β-D-glucopyranose(GlcNAc unit) and 2-amino-2-deoxy-β-D-glucopyranose(GlcNH2 unit),is derived from chitin by alkaline deacetylation.In the present work,the narrow molecular weight distribution chitooligosaccharides were prepared by degraded CTS with a microwave-assisted-cleavage method of metal-coordinating template-absorption catalytic oxidation.Under physiological pH conditions,the interaction of CTS and the narrow distribution chit...