1. Food and Health R&D Laboratories, Meiji Seika Kaisha, Ltd., 5-3-1 Chiyoda, Sakado-shi, Saitama 350-0289, Japan; Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; and Department of Food Science and Technology, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa-shi, Kanagawa 252-8510, Japan