1. School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
2. The Provincial Education Key Laboratory of Screening, Evaluation and Advanced Processing of Traditional Chinese Medicine and Tibetan Medicine, School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China
3. Department of Chemistry, Lanzhou University, Lanzhou, P.R. China
4. Insititute of Plant Protection, Gansu Academy of Agricultural Sciences, Lanzhou, P.R. China