By using quercetin and rutin as standard substances, the flavonide content of Ginkgo biloba L has been determined with spectrophotometry. When the flavonide content is at a high level, the flavonide content can be fixed quantitatively when quercetin at 370 nm,or Rutin at 360 nm. But the flavonide content can not be fixed quantitatively with quercetin and rutin when the flavonide content is at a low level. When concentration of quercetin solution is at 4～20 μg/ml,or that of rutin solution is at 8～24 μg/ml,...
【正文快照】
银杏 (Ginkgo biloba L.) ,又名白果树、公孙树 ,属裸子植物 ,是银杏科银杏属的唯一生存种 ,是我国特有的古老树种之一 ,为世界珍贵药用植物资源。银杏叶中主要存在两类活性物质 :黄酮类化合物(flavonoides)和萜内酯 (ginkgolides and bilobalide) [1] 。银杏叶黄酮类化合物大?
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