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采用三柱萃取法从银杏叶中分离提纯得到近白色银杏征内酯晶体，其纯度可达90％以上。其中，白果内酯为19．9％～33．3％，银杏内酯A，B，C分别为28．5％～47．8％，19．7％～22．9％，1．0％～10．4％。从而解决了国内银杏萜内酯提取损失的问题。
The three-column extraction method was used to separate and purify the nearly white ginkgo bilobalide crystals from Ginkgo biloba leaves with the purity of over 90%. Among them, bilobalide was 19.9% -33.3%, ginkgolide A, B and C were 28.5% -47.8%, 19.7% -22.9%, 1.0% ~ 10.4%. Thus solving the problem of loss of extraction of domestic ginkgolides.