Abstract:

Attapulgite-chitosan complex was prepared for use in removing cadmium from glycosaminoglycan-rich enzymatic
hydrolysates of the entire viscera of Ostrea rivularis Gould. The influence of hydrolysate pH, shaking speed and time, and
complex-to-hydrolysate ratio on cadmium removal rates and glycosaminoglycan recovery was explored. By using response
surface methodology, the optimized experimental conditions were obtained as hydrolysate pH 7.2, addition of the complex
in a proportion of 6.4 mg/mL, and shaking at a speed of 170 r/min for 30 min. The removal rate of cadmium under these
conditions was 73.7%, and the recovery of glycosaminoglycan was 44.1%. This study indicates that attapulgite-chitosan
complex can effectively remove cadmium from glycosaminoglycan from Crassostrea rivularis, with no significant impact
on the recovery of glycosaminoglycan.