| abstract |
PURPOSE:To reduce ash content and to obtain industrially advantageously the titled colorless and odorless substance, by hydrolyzing animal protein such as collagen, keratin, silk, etc. with an acid, alkali, enzyme, etc., and desalting and purifying formed polypeptide by electrodialysis. CONSTITUTION:Animal protein such as collagen, keratin, silk, etc. is hydrolyzed with an acid, alkali, or enzyme(e.g, pepsin, etc.), to give a neutral aqueous solution of the formed polypeptide having 300-2,000 average molecular weight, which is subjected to electrodialysis by the use of an aqueous solution of sodium sulfate as an anode solution and a cathode solution, so that it is desalted and purified, to give the aimed polypeptide having <=1wt% reduced ash content based on the polypeptide. |