Experimental
Materials and methods
Ginkgo biloba leave were washed and dried under 60°C
and was shattered into powder, and the powder was
heated with water or alcohol for 4 h. Then a yellow
aqueous extract was filtered to yield dry extract after
removal of the solvent. The extract yield from the
water and alcohol were named as WE and AE, and extraction
rate of water and alcohol is 29.8% and 18.7%
respectively.