摘要：目的探讨龙眼核中总黄酮的提取及鉴别方法，以充分利用龙眼核植物资源，避免资源的浪费。方法 采用乙醇提取法从龙眼核中提取黄酮类物质，对所提取的黄酮类物质进行验证，并用分光光度法测定其含量。结果测得样品中总黄酮的含量C=1.634mg/ml，回收率为99.65%，其纯度和产率均较高。结论该方法采用全物理过程，无任何污染，是提取龙眼核黄酮类物质的有效途径。

    关键词：乙醇提取； 龙眼核； 总黄酮； 鉴别

    (Department of Chemistry, Youjiang Medical College for Nationalities，Baise, Guangxi ,533000，China )

    Abstract:ObjectiveIn order to make use of the resources of longan seed , avoid wasting and approach the extraction of total flavanone of longan seed.MethodsThe flavonids were extracted from longan seed with ethanol .Using spectrophotometry to extract and check the flavanone of longan seed. Results By this method getting the contents of the total flavanone of longan seed is C=1.634mg/ml and the rate of recovery is 99.65%. ConclusionThis text provides the extraction and purifying methods to get the outcome and the purity of the flavanone is all very high .This method is a purely physical process and has not any pollution. It is an ideal way to extract the flavanone of longan seed.

    Key words:extracted by ethanol; longan seed; total flavanone; identification ......