| abstract |
(57) [Summary] [Object] The present invention provides a reduced keratin peptide having an average molecular weight of 300 to 2000 in a state in which amino groups, carboxyl groups and mercapto groups are abundantly contained. This is manufactured efficiently. [Structure] Keratin protein is hydrolyzed to a low molecular weight (average molecular weight 300 to 2000) by a method using an acid, an alkali and a protease, and then electrically reduced or sodium sulfide, thioglycolic acid, cysteine, N- Reduction with a reducing agent such as acetyl-L-cysteine, A reduced keratin peptide is produced. |