1. Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kitashirakawa, Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, 852-8521, Japan, Department of Hygienic Sciences, Kobe Pharmaceutical University, Kobe, 658-8558, Japan, and Laboratory of Nutrition, Koshien College, 4-25 Kawarabayashi-cho, Nishinomiya, 663-8107, Japan