1. Institute of Nutrition and Food Hygiene, School of Public HealthLanzhou University Lanzhou P. R. China
2. CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu ProvinceLanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou P. R. China
3. Center of Resource Chemical & New Material Qingdao P. R. China
4. University of Chinese Academy of Sciences Nanning P. R. China