PREPARATION PROCESS OF MEDICAL CHITIN AND CHITOSAN USING LOW TEMPERATURE TREATMENT

摘要

Described are a process for producing chitin with high purity from crab promontory and a process for producing chitosan having deacylation degree and high molecular weight. This chitin is obtained by followings: drying and grinding crab promontory; treating the grinded promontory in 1.5-7N HCl at -40 to -10 deg. C for 3-20 hours; washing, filtrating, treating withorganic solvent and drying; treating with NaOH solution, followed by washing, filtrating and drying.