FIELD: biology, toxicological chemistry, veterinary. SUBSTANCE: a sample under testing should be reduced followed by multiple treatment with dimethylformamide, obtained extractions are combined and dissolved with water solution at 1: 3 ratio according to the volume, then it is extracted with chloroform, an extract is isolated and treated with water-alkaline solution of 10.5-11.0 pH, alkaline solution is separated and acidified up to 6-7 pH and extracted with water-saturated diethyl ether, ether extraction is isolated, extragent is evaporated, dry residue is dissolved in organic solvent and chromatography is conducted in thin layer of silica gel in 7:3 acetonechloroform solvents system. EFFECT: higher efficiency to be applied in the practice of sanitary epidemic stations, chemical-toxicological and veterinary laboratories. 3 tbl
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