FIELD: medicine, chemical-pharmaceutical industry. SUBSTANCE: method involves preliminary treatment of larch wood with boiling water followed by extraction with an aqueous solution of acetone and purification of an aqueous-acetone extract by liquid chromatography on reverse-phase sorbents Spherisorb C2-C18 (particle size is 5-10 mcm). Mobile phase: 30-50% acetone solution in 0.1% an aqueous solution of trifluoroacetic acid. Acetone is removed by evaporation. Purity of dihydroquercitin is above 99.5%. EFFECT: improved purity of the end product. 1 dwg
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