FIELD: chemistry.
SUBSTANCE: invention relates to a method of removing pesticides from Ginkgo biloba extracts. The method involves subjecting an extracted obtained by extracting Ginkgo biloba leaves with hexane, comprising the following steps: a) liquid-liquid extraction to obtain a medium polarity fraction containing ginkgo terpenes and pesticides not removable with hexane, and a high polarity fraction containing ginkgo flavone glycosides; b) crystallisation from the medium polarity fraction obtained at step a) to form an intermediate with ginkgolide content of not less than 50%; c) crystallisation from the residual solution obtained at step b) to obtain an intermediate product with bilobalide content of not less than 50%; d) mixing of the high polarity fraction obtained at step a) with the ginkgo terpene intermediate product and the bilobalide intermediate product obtained at steps b) and c).
EFFECT: invention enables to obtain a product with a given ratio of terpenes, in which residual content of pesticides is considerably low or pesticides are completely removed.
4 cl, 1 tbl, 5 ex
