1. College of Food Science of Nutritional Engineering, China Agricultural University, Beijing, China, 100083.
2. Ruican Wang and Yijing Chen contributed equally to this work.
3. Corresponding author. Box 303, China Agricultural University, No. 17 Qinghua Donglu Haidian District, Beijing, China, 100083. Phone: +86-10-62737634. E-mail: Shuntang@cau.edu.cn