银杏叶黄酮的乙醇提取方法研究

研究了银杏叶总黄酮含量的季节悸变化规律及利用乙醇提取银杏叶黄酮的方法，结果表明，根据银杏叶在一年生长间总黄酮含量确定银杏叶最佳采收时间为8－9月份，通过单因素试验和正交试验，确定乙醇提取银杏叶总黄酮的最佳条件为：银可中粉碎至50－60目，以70％乙醇按照液固比6：1的比例，于80℃条件下提取2次，每次1h，银杏叶总黄酮提取率可达87．6％。

Studies on the alcohol extracting technology of flavonoids in Ginkgo biloba leaves

The proper season for collecting Ginkgo biloba L.leaves,the alcohol extracting technology of flavonoids in Ginkgo biloba L.leaves were studied in this paper.The main results show:Through determining the total flavonoids in the Ginkgo biloba L.leaves from April to December,it was found that Ginkgo biloba L.leaves should be collected from August to September;The optimum extracting technology of flavonodis in Ginkgo biloba L.leaves was investigated by using the factorial and orthogonal design.The results showed that particles being 50～60 meshes,80℃,6∶1 of 70% alcohol to Ginkgo biloba L.leaves weight ratio,extraction for 2 times and 1 h for each time were optimal.The flavonids extraction rate was as high as 87.6%.