Patent ID: 8530405

Claim:
A method of preparing a biodegradable antimicrobial agent, comprising: (a) forming an aqueous polypeptide solution by dissolving a polypeptide into an aqueous solution, wherein the polypeptide compound is polyglutamic acid or polyaspartic acid, and an added amount of the polypeptide in the aqueous polypeptide solution is 100 parts by weight; (b) providing an aqueous sodium hypochlorite solution, wherein an added amount of the sodium hypochlorite in the aqueous sodium hypochlorite solution is 5-130 parts by weight; (c) adding the aqueous sodium hypochlorite solution into the aqueous polypeptide solution to form a mixture; and (d) mixing the mixture for at least 1 min, such that the polypeptide compound reacts with sodium hypochlorite in the aqueous sodium hypochlorite solution, thereby forming a polypeptide chloride having at least one N-halamine group of N—Cl, wherein the polypeptide chloride is polyglutamic acid chloride or polyaspartic acid chloride.