The shell of crabs used as the materials was made into chitin by means of decalcification and deproteinization,the solid chitosan was obtained through deacetyl in chitin.

• 以蟹壳为原料,采用化学方法先将原料脱钙、脱蛋白质制成甲壳素,再脱甲壳素中的乙酰基,制成壳聚糖固体。