Ginkgo biloba flavonoid extract which is terpene-free and/or has high flavonoid heteroside content

摘要

A process for preparing a flavonoid extract from the leaves of ginkgo biloba comprising multiple distractions of the leaves of the ginkgo biloba with solvents wherein at least one of the extraction stages is a deterpenation step using a solvent of the formula RC(O)OR' wherein R and R' are individually lower alkyl.