Patent ID: 9662400
Date: 2017-05-30
CPC Classifications: A61K,A61L,A61P,C08B,C08L

Claim:
1. A method for producing a biodegradable chitosan film or sponge, the method comprising (a) dissolving chitosan in a 3:1 ratio of lactic and acetic acid solution; (b) forming the chitosan into a desired shape and lyophilizing the chitosan to form a dehydrated acidic chitosan composition; (c) neutralizing the dehydrated, acidic chitosan composition by hydrating it in an aqueous sodium hydroxide solution; (d) washing the chitosan composition in water to remove residual acidic and basic products; (e) soaking the chitosan composition in an acetate buffer solution for about thirty minutes; and (f) freezing and lyophilizing the chitosan film or sponge.