FIELD: medicine. SUBSTANCE: L-ascorbic acid is used as reagent 1. a-glucozyl saccharide being chosen of group which contains: maltoligo saccharide, product of partially hydrolysis of starch, starch being converted into liquid, jelly-like starch, soluble starch or their mixture and having concentration 0.5-30 times more than concentration of L-ascorbic acid is used as reagent 2. Saccharide being chosen of group which contains cyclomaltodextrine glucotransferase and a-glucosidase is used as reagent 3. Said saccharide enables to transfer ferment at pH 3-9 and 20-80 C, presence of glucoamilase being possible. Desired product is prepared by crystallization of supersaturated solution in the presence of seed, its quantity being 0.1-10 mass EFFECT: improves quality of desired product. 5 cl, 1 tbl
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