| abstract |
PROBLEM TO BE SOLVED: To provide a hydrolyzed peptide or a derivative thereof obtained by hydrolyzing a protein derived from a natural product such as an animal, a plant or a microorganism without deteriorating the properties possessed by the peptide or its derivative. Is added. SOLUTION: N, N'-dicarboxyanhydrocystine is reacted with a hydrolyzed peptide or a derivative thereof obtained by hydrolyzing a protein derived from a natural product such as an animal, a plant, or a microorganism in the presence of an alkali, and thereafter, By decarboxylation using an acid, cystine is introduced into the hydrolyzed peptide or a derivative thereof to produce a cystine-introduced peptide to which the property of cystine is added in addition to the property of the hydrolyzed peptide or its derivative. . |