Comparative Study on the Contents of Flavonoids and Lactones in Ginkgo Pollen from Different Regions

The contents of flavonoids and lactones in ginkgo pollen over one-hundred-years-old male ginkgo trees from 15 different regions were analysized by HPLC.The results were as follows: the average content of total flavonoids of ginkgo pollen was 20.44 mg/g.The component of lactones firstly detected from ginkgo pollen was ginkolide A,and its average content was 2.22 mg/g.Correlation analyses showed that the contents of flavonoids and lactones from ginkgo pollen in different regions didn't remarkably correlate with climatic and geographical factors.Chongqing-01,Guangde-01,Beijing-01,Kangxian-01,were primarily selected for selecting superior-individual and establishing pollen-producing plantation of ginkgo.