FIELD: biotechnology. SUBSTANCE: slaughtering blood is frozen repeatedly in combination with defrosting, milled and subjected for enzymatic hydrolysis for 2 stages and acid hydrolysis. Any enzyme is used for enzymatic hydrolysis at additional use of sodium citrate, toluene or ethanol and pancreatin and protosubtilin also. Blood protein hydrolyzate is used in food, medicinal, microbiological and perfume industries. EFFECT: improved method of preparing. 2 cl, 1 tbl
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