1. College of Food Science and Engineering, Shandong Agricultural University, 61 Daizong Street, Taian, Shandong 271018, P.R. China
2. College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, P.R. China
3. Qinghai Provincial Key Laboratory of Tibetan Medicine Research & Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, Qinghai 810001, P.R. China