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Study on optimum extraction process of flavonoids from Ginkgo biloba L

Hu Min(49)  
The optimum extracting conditions of flavonoids in Ginkgo biloba L.were investigated by using the orthogonal design.The results showed that 90℃,9∶1 of 70% ethanol to Ginkgo biloba L.weight ratio,extraction for 4 times and lh for each time were optimal.The average extraction rate was as high as (95 6±1)%.The average recovery of total flavonoids determined by spectrophotometry was 102 8% and the coefficient of variation was 0 41%.
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