METHOD OF PRODUCING PROTEIN HYDROLYZATE FROM KERATIN-CONTAINING RAW MATERIAL

FIELD: biotechnology. SUBSTANCE: invention relates to technology of production of protein product from animal-origin keratin-containing raw material for use in pharmaceutical industry, cosmetics, food industry as well as in cattle breeding when preparing food additives. Protein hydrolyzate is prepared in enzymatic process involving preliminarily treating starting material with sodium sulfite aqueous solution at pressure 0.1-0.3 MPa. Advantageously, starting material is poultry fuzz-feather, which is treated with 0.1-0.5% sodium sulfite aqueous solution at weight ratio of raw material to treatment solution between 1:10 and 1:20, whereas enzymatic hydrolysis is carried out in presence of enzyme exhibiting proteolytic activity at least 10000 units per 1 kg raw material at continuous stirring of reactants with a speed of 90 to 150 rpm. Resulting product is preferably recovers by separation and/or filtration followed by drying, preferably spray drying, while spent sodium sulfite solution is recycled. EFFECT: enabled efficient separation of treated raw material and aqueous sodium sulfite solution, which along with recycling of chemical reagent leads to reduced expenses. 10 cl, 2 tbl, 4 ex