FIELD: biotechnology, blood proteins. SUBSTANCE: erythrocyte hemolyzate is prepared by dilution of erythrocyte mass with distilled water at ratio = (1: 2)-(1: 4), freezing and the following concentration of hemolyzate by ultrafiltration and sterilizing filtration and lyophilization. Yield of crystalline hemoglobin is above 95%, purity is above 80%. Product is used in agriculture as food addition for treatment and prophylaxis of iron-deficiency states in animals and in human also. Product is used in diagnostic investigations and in science studies also. EFFECT: simplified method, decreased cost, increased yield, enhanced purity of product. 1 tbl
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