1. Research Laboratory for Fundamental Technology of Food, Asahi Breweries, Ltd., Ibaraki 302-0106, Japan
2. Products Research & Development Laboratory, Asahi Soft Drinks Co., Ltd., Ibaraki 302-0106, Japan
3. National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization (NARO), Kagoshima 898-0087, Japan
4. National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization (NARO), Shizuoka 428-8501, Japan