| abstract |
A process for the preparation of a mixture of proteins and amino acids predominantly containing aspartic acid by hydrolysis of the feather and / or animal cartilage-containing material, wherein the hydrolysis is carried out in a water-containing reaction mixture and an acidic organic acid catalyst containing one or more carboxyl groups. a pKa of less than 4, in a stirred batch reactor for 0.5 to 10 hours in a temperature range of 90 to 150 degC and at a minimum pressure of 1 bar. |