Best harvesting time of Ginkgo Folium from Guilin / 中草药

ABSTRACT

Objective: There are abundant Chinese medicinal herb resources in Guangxi province. Especially, there are lots of Ginkgo Folium in the north. To detect the contents of the total flavonoid glycoside and lactone in Ginkgo Folium and to find out their best concentration ratio during the year. Methods: The reflux method was used for the distillation of the total flavonoid glycoside and lactone in Ginkgo Folium and HPLC was used for quantitative analysis. The contents of the total flavonoid glycoside and lactone in Ginkgo Folium were determined on a Ultimate XB-C18 (250 mm × 4.6 mm, 5 μm) analytical column with different mobile phases and detectors. Results: The concentration ratio of the total flavonoid glycoside and lactone in Ginkgo Folium in August was the smallest and their contents were high. Conclusion: There is significant difference between total flavonoid glycoside and lactone content in Ginkgo Folium from different picking periods during the year, and the concentration ratio of the two compositions in August is the smallest with high contents, which can be used to provide the basis for guiding the farmer to collect Ginkgo Folium in August.