FIELD: medicine.
SUBSTANCE: invention refers to a method of Δ4-3-ketosteroids 11 β-hydroxylation by a biomass Curvularia lunata strain mycelium, RNCIM No. F-988. For the transformation, Curvularia lunata strain mycelium, RNCIM No. F-988 not older than 30 h and washed of nutrient medium is used. Mycelium is taken in such amount that the relation of the biomass to the transformed steroid makes 1.5-2.5:1. The transformation is performed in a buffer solution, and a steroid substratum is added as a microcrystal suspension, or as a water-soluble methyl - β-cyclodextrine complex with steroid related thereto as 1:1-0.6:1 (mol/mol). The yield of 11β-hydroxyderivatives is 50-80 %.
EFFECT: offered invention allows for higher selectivity of 11β-hydroxylation process, concentration of the transformed steroid substratum up to 20 g/l and reduced reaction period to 24-50 h.
1 tbl, 10 ex, 2 cl
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