FIELD: pharmaceutical industry and technology, pharmacy.
SUBSTANCE: invention relates to the improved method for preparing dihydroquercitin. Invention involves preliminary separation of volatile nonpolar compounds with steam at rapid change of pressure from 0.1 to 0.3 MPa in reactor carried out before extraction stage and with reduced time of raw extraction being without milling wood under conditions of mild mechanical-chemical effect and without destruction of wood occurring in rapid change of pressure from 0.1 to 0.5 MPa using mixture of polar solvent with water or their mixtures as an extractant. Invention reduces extraction time in intensifying and optimization of the process of dihydroquercitin that provides reducing total time of process from 60-75 min to 7-9 min and to simplify technology in carrying out the process without milling wood.
EFFECT: improved method for preparing.
5 ex
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