1. Department of Biology and Chemistry, Hunan University of Science and Engineering, Yongzhou Hunan 425199, P.R. China
2. Hunan Key Laboratory of Comprehensive Utilization of Advantage Plants Resources of Hunan South, Hunan University of Science and Engineering, Yongzhou Hunan 425199, P.R. China
3. Hunan Hengwei Pharmaceutical co., LTD, Yongzhou Hunan 425199, P.R. China
4. Hunan Provincial Engineering Research Center for Ginkgo biloba, Hunan University of Science and Engineering, Yongzhou Hunan 425199, P.R. China