1. Center for Food Quality, Labeling and Consumer Services, 2-1 Shintoshin, Chuo-ku, Saitama-shi 330-9731, Japan; Hokkaido Kitami Agricultural Experiment Station, 52 Jiyayoi, Kunneppu-cho, Hokkaido 099-1496, Japan; and National Food Research Institute, 2-1-12, Tsukuba-shi, Ibaraki, 305-8642, Japan