1. Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, P. R. China
2. The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China
3. Research and Development Centre of Food Proteins, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China