FIELD: analytical chemistry. SUBSTANCE: sample of preparation is dissolved in alcohol-chloroform solution followed by measurement of optical density of sample against oily carotene solution. In parallel similar assay of quercitin is carried out in solution and flavanoid content is calculated by the formula: C = 
x 100% where: ДI - optical density of experimental sample; Дo - optical density of quercitin solution; mo - weight of experimental sample, g; mI - quercitin weight, g; PI - experimental sample dilution degree; Po - quercitin solution dilution degree. EFFECT: improved method. 3 dwg, 1 tbl
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