1. Division of Applied Bioscience, Research Faculty of Agriculture, Hokkaido University, Kita-9, Nishi-9, Kita-ku, Sapporo 060-8589, Japan
2. Department of Biofunctional Science and Technology, Graduate School of Biosphere Science, Hiroshima University, 1-4-4, Kagamiyama, Higashi-Hiroshima 739-8528, Japan
3. Nihon Shokuhin Kako Company Limited, 30 Tajima, Fuji, Shizuoka 417-8530, Japan