1. College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
2. Qinghai Provincial Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, 23 Xinning Road, Xining, Qinghai 810008, P. R. China
3. Shaanxi Institute for Food and Drug Control, Xi’an 710065, China
4. Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F UniversityYangling 712100, Shaanxi, China