1. School of Pharmacy Lanzhou University Lanzhou 730000 China
2. Gansu Institute for Drug Control Lanzhou 730000 P. R. China
3. State Drug Administration‐Key Laboratory of Quality Control of Chinese Medicinal Materials and Decoction Pieces Lanzhou 730000 P. R. China
4. Gansu Engineering Technology Laboratory for Inspection and Testing of Chinese and Tibetan Medicine Lanzhou P. R. China