从银杏叶中提取银杏黄酮的最佳工艺条件研究

Study on the Optimum Technological Conditions of Extracting Flavone from Leaves of Ginkgo biloba L.

对用９０％乙醇从银杏叶提取银杏黄酮的工艺进行了研究，得到最佳工艺条件为：采用５次水沉降除杂；在ｐＨ３～４条件下吸附；对吸附过树脂采用树脂重量的１３倍水洗和７倍２５％乙醇洗；树脂每吸附过３次再生１次；洗脱液经喷雾干燥得产品。在此最佳工艺条件下得到的银杏黄酮，黄酮含量大于２６％，内酯含量大于６％。

This paper is concerned with the technique of extracting flavone from leaves of Ginkgo biloca L.with 90% ethanol.And the optimum operation is gained:settling GBE with water 5 times per operation;absorbing when pH=3～4;scrubbing the resin with water that is 13 times the volume of the resin and with 25% ethanol that is 7 times the volume of the resin;regenerating the resin after it has used three times;drying the elution by spray drying.Under the optimum technological conditions,the contect of the flavone in the product is above 26% and of the Ginkgolide A.B.C is above 6%.