Methods Chitin was prepared from fresh shrimp shells and then carboxymethylchitin was prepared by the methods of alkalization and etherification as well as by the purification technique.

• 方法 以新鲜虾壳为原料制备几丁质，然后采用碱化和醚化反应以及提纯工艺制备羧甲基几丁质。