Method for making water-soluble hydrolyzates of keratinaceous materials
AssigneesFirma Carl Freudenberg, R/hm GmbH
InventorsKlaus Braeumer, Zdenek Eckmayer, Alexander Berg, Rolf Monsheimer, Ernst Pfleiderer
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Abstract
A method is disclosed for making a water-soluble hydrolyzate of a keratinaceous starting material which comprises first subjecting said starting material to acid treatment at a pH of 2 or below and at an elevated temperature above 80.degree. C. to effect mild hydrolysis thereof and then enzymatically degrading said acid-treated material in an aqueous bath in the presence of urea with an alkaline proteinase having an activity optimum in a range between pH 9 and pH 13, the initial pH of the enzymatic treatment being within the pH range optimum for the enzyme employed.
Claims8
A method for making a water-soluble hydrolyzate of keratinaceous starting material, wherein the keratinaceous starting material is selected from the group consisting of loose hair, loose wool, scales, nails, claws, hooves and horns, which method comprises first subjecting said starting material to acid treatment in a treating bath at a pH of 2 or below and at an elevated temperature above 80.degree. C. to effect mild hydrolysis thereof and then enzymatically degrading said acid-treated material in an aqueous bath at a temperature between about 30.degree. C. and 70.degree. C. for 4 hours to 24 hours in the presence of urea with an alkaline bacterial proteinase having an activity optimum in a range between pH 9 and pH 13, the initial pH of the enzymatic treatment being within the pH range optimum for the enzyme employed.
Dependencies are inferred from the claim text.