徐州地区银杏叶类黄酮含量的季节性动态变化

Seasonal Variation of Flavonoid Content in Ginkgo biloba L. Leaves in Xuzhou

为了掌握徐州地区银杏叶中类黄酮含量的变化规律,确定徐州地区银杏叶的采摘季节,本研究采用乙醇-超声波提取法提取银杏叶中的类黄酮,纯化后用紫外分光光度法,对徐州地区不同性别、不同生长季节的银杏叶片类黄酮含量进行了测定。结果表明:4月和5月雄株叶片的类黄酮含量>雌株,其他月份均为雌株叶片类黄酮含量>雄株,2种银杏叶片的类黄酮含量均以5月和8月较高。综合考虑认为,徐州地区药用银杏叶以8月下旬采摘为宜,以雌株更好。

In order to know the seasonal variation of the content of flavonoid in Ginkgo biloba L. leaves in female and male tree, determine the picking season of Ginkgo biloba L. leaves in Xuzhou. The flavonoid was extracted by ethanol-ultrasonic method, the contents of flavonoid in season were abstracted and measured by content of flavonoid in Ginkgo biloba L. Ginkgo biloba L. leaves in different gender and growth by UV spectrophotometry after purification. The results showed that the leaves in Xuzhou was the highest in May and August, the content of flavonoid in the leaves of male trees was higher than that of female trees in April and May, which was lower than that of female trees in other months. Comprehensive consideration, the suitable picking season of medical biloba L. leaves in Xuzhou was in late August, and female trees was better. Ginkgo