Seasonal Variations of the Flavonol Glycoside Content from Ginkgo biloba Leaves

은행잎중 Flavonol Glycoside 성분의 계절별 함량 변화에 관한 연구

  • 강규선 (중앙대학교 약학대학) ;
  • 염정록 (중앙대학교 약학대학) ;
  • 강삼식 (서울대학교 천연물과학연구소)
  • Published : 1993.03.30

Abstract

The seasonal variations of the major six flavonol glycosides(kaempferol 2,6-dirhamnosyl glucoside, quercetin 3-O-rutinoside, kaempferol 3-O-rutinoside, isorhamnetin 3-O-rutinoside, quercetin 3-O-coumaroyl glucorhamnoside and kaempferol 3-O-coumaroyl glucorhamnoside) in Ginkgo biloba leaves were investigated. The contents were determined by HPLC on reversed phase $C_{18}$ column. This result showed that the percentage of six flavonol glycosides decreased during the season from 1.57% in May to 0.39% in November. The content of each flavonol glycoside indicated a similar tendency to decrease. However, the contents of rutinosides of kaempferol, quercetin and isorhamnetin fluctuated markedly than those of coumaroyl glucorhamnosides of kaempferol and quercetin and kaempferol 2,6-dirhamnosyl glucoside.

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