1. Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
2. Central Research Laboratory of Nisshin OilliO Group, Ltd., 1 Shinmori-cho,
Isoko-ku, Yokohama-shi, Kanagawa 235-8558, Japan
3. School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526 Japan