Chitosan is a deacetylated product of chitin,because of its non-toxic,biodegradable, biological dissolvability and the good characteristics of the film,in recent years it has been used in the chemical industry,environmental protection,medicine,food.However,chitosan can only dissolve in acidic solution,not directly dissolved in the water,so preparation of water-soluble is becoming a new research direction.There are much lively hydroxy,amino on chitosan macromolecules,so we can use chemical modification,degra...
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