A preparation method for extract of Ginkgo biloba leaf having increased contents of quercetin and kaempferol

摘要

The present invention provides a method for preparing a ginkgo leaf extract with an increased content of quercetin and kaempferol, comprising the step of extracting quercetin and kaempferol by adding a mixed solvent of sulfuric acid (H 2 SO 4 ) and acetone to ginkgo leaves, The present invention relates to a ginkgo leaf extract prepared by the above manufacturing method, a cosmetic composition comprising the ginkgo leaf extract, and a method for enhancing the content of quercetin and kaempferol in the ginkgo leaf extract. The method for extracting ginkgo leaves according to the present invention can obtain the maximum amount of quercetin and kaempferol contained in ginkgo leaves, so it is usefully used for the preparation of ginkgo leaf extract and the purification of quercetin and kaempferol, which are functional ingredients can be