1. College of Food Science and Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China
2. College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China
3. Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P. R. China
4. Research Institute of Food Science, Hangzhou Wahaha Group Company Ltd., Hangzhou 310018; P. R. China