1. Dept. of Food Science and Engineering, School of Agriculture and Biology; Shanghai Jiao Tong Univ.; Shanghai 200240 China
2. School of Biological Sciences; The Univ. of Hong Kong; Pokfulam Road Hong Kong
3. Guangdong Provincial Key Laboratory of Food, Nutrition and Health, School of Public Health; Sun Yat-sen Univ.; Guangzhou 510080 China
4. Faculty of Agricultural Sciences; Sabaragamuwa Univ. of Sri Lanka; P.O. Box 02 Belihuloya Sri Lanka