DEFINITION

Powdered Ginkgo Extract is prepared from dried and comminuted leaves of Ginkgo extracted with an acetone–water mixture or other suitable solvents. The ratio of the crude plant material to Powdered Extract is between 35:1 and 67:1. It contains NLT 22.0% and NMT 27.0% of flavonoids, calculated as flavonol glycosides, with a mean molecular mass of 756.7, on the dried basis. It contains NLT 5.4% and NMT 12.0% of terpene lactones, consisting of between 2.6% and 5.8% of bilobalide (C₁₅H₁₈O₈) and between 2.8% and 6.2% of the sum of ginkgolide A (C₂₀H₂₄O₉), ginkgolide B (C₂₀H₂₄O₁₀), and ginkgolide C (C₂₀H₂₄O₁₁), on the dried basis.