The synthesis and characteristic of degradation produces on different molecular weight chitosan with zinc complex

A series of Chitosan (CTS) with different molecular weight (MW) were obtained using H2O2 as degrading reagent, and the adsorptive behavior of the degraded chitosan to Zn(II) was studied. Experiments showed, the adsorption capacity increased with the increase of the MW of the chitosan at beginning and then reached a plateau at 40degreesC and pH 5.0 when the initial concentration of Zn(II) is 2.0 g/L. The complex of chitosan-Zn(II) was prepared and characterized by elementary analysis, ultraviolet-visible spectroscopy and infrared spectroscopy. Meanwhile the adsorptive behavior of the complex to urea in the blood of kidney failure and uraemia patient was investigated. The result showed the average adsorption capacity for urea is 85.61, 84.32 and 83.97 mg/g for the chitosan of 50,000, 1000,000 and 780,000 MW respectively, the capacity is higher than the other adsorptive materials in clinical use.