英文摘要 |
A simple and rapid HPLC method was developed to evaluate and validate the assay of quercetin, kaempferol and isorhamnetin in Ginkgo biloba extract and its products. The column used is Cosmosil 5C18-AR, and mobile phase is MeOH:0.3%H3PO4 (1:1). The correlation coefficients of linear calibration for quercetin, kaempferol and isorhamnetin are 0.9999, 0.9999, and 0.9989, respectively. The relative standard deviations of intra-day assays for quercetin, kaempferol, and isorhamnetin are 0.29%, 0.28%, and 1.90%, respectively; interday assays are 0.95%, 0.85%, and 1.67%, respectively. The recoveries of quercetin, kaempferol and, isorhamnetin are 87.4%, 94.0%, and 72.4%, respectively. The optimal condition for acid hydrolysis of flavonoid glycosides in Ginkgo biloba extract could be achieved by refluxing with 20.0% HCl at 85°C for 15 min or with 5.5% HCl at the same temperature for 30 min.
本研究針對有關銀杏葉浸膏原料及製劑內qucercetin, kaempferol 及isorhamnetin 之HPLC定量方法進行評估,結果顯示,分析條件使用Cosmosil 5C18-AR層析管,以MeOH : 0.3%H3PO4(1:1)為移動相,分離效果良好。各成分檢量線之相關係數分別為quercetin r = 0.9999 , kaempferol r = 0.9999 , isorhamnetin r = 0.9989 ,而同日內檢測之相對標準偏差分別為0.29% , 0.28% ,及1.90% ,異日間檢測之相對標準偏差分別為0.95%,0.85% 及1.67% ,其添加回收率則分別為87.4% ,94.0% 及72.4% 。另外檢體前處理之方法,使用20%HCl溶液經15分鐘加熱迴流,與使用5.5%HCl溶液經30分鐘加熱迴流,可得到相近之水解效果。 |