| 摘要 |
The method for extracting and purifying a flavonoid cpd. from gingko leaves comprises (a) extracting and filtering the gingko leaves with an aqueous dioxane solution of pH 8-13 selected from dioxane/water, dioxane/lower alcohol/water and dioxane/lower ketone/water at 30˜55deg. C, (b) extracting the filtered aqueous solution layer with a water-insoluble organic solvent, and extracting and distributing the layer with an organic solvent i.e. butyl alcohol, amyl alcohol, methyl ethyl ketone or ethylacetate, (c) drying the organic solvent layer at 600mmHg or less, and (d) extracting it with an ethyl ether or a petroleum ether. The flavonoid cpd. is useful as a circulatory drug.
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