1. Research Laboratories for Fundamental Technology of Food, Asahi Breweries Limited, 1-21, Midori-1, Moriya-shi, Ibaraki 302-0106, Japan
2. Advanced Elements Chemistry Laboratory, The Institute of Physical and Chemical Research, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
3. National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 2769 Kanaya, Shimada-shi, Shizuoka 428-8501, Japan