FIELD: food industry. SUBSTANCE: invention relates to preparing protein concentrate from defatted soybean flour or oil cake using enzymes. At the stage of extraction of nonprotein components the enzyme preparation of thermostable α-amylase isolated from the modified strain Bacillus licheniformis is used and temperature in extraction medium is increased to 85-95 C. Invention ensures to decrease enzyme preparation dose, extraction time and amount of the following aqueous washings of concentrate without quality loss of ready product. EFFECT: improved method of preparing. 2 cl, 1 tbl
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