1. School of Pharmaceutical Science and Technology, Tianjin University, Weijin Road, Tianjin 300072, China.
2. School of Chemical Engineering and Technology, Tianjin University, Weijin Road, Tianjin 300072, China.
3. Corresponding author. Phone: +86 2287401895. E-mail: biochemgao@163.com
4. School of Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China.