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US 4,304,905 AGranted
Method for preparing a carboxyalkylated chitin and a derivative thereof
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorJunichi Koshugi
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Abstract
Disclosed herein a method for preparing carboxyalkylated chitin from chitin and a method for preparing a de-acetylated substance of the carboxyalkylated chitin.
Claims13
A method for preparing a carboxyalkylated chitin, comprising:
- immersing chitin in an aqueous highly concentrated alkali solution;
- freezing the chitin-immersed alkali solution at a temperature of -3.degree. to -30.degree. C.;
- and
- dispersing the frozen alkali-containing chitin into an organic solvent containing an etherifying agent, thereby to etherify a hydroxyl group of the chitin, said etherifying agent having the following general formula:
- X(CH.sub.2).sub.n COOH
- wherein X is a chlorine atom or a bromine atom, and n denotes an integer of 1, 2 or 3.
3 more elements
Dependencies are inferred from the claim text.