1. Department of Chemistry, Faculty of Science, Ehime University, Matsuyama 790-8577, Japan
2. Research Institute, Kagome Company Ltd., 17 Nishitomiyama,
Nasushiobara-shi, Tochigi 329-2762, Japan
3. Department of Food Science, Graduate
School of Nutrition and Bioscience, The University of Tokushima, Tokushima 770-8503, Japan