1. Author Fukuda is with Food Check & Analysis Center, Agricultural Research Inst; HOKUREN Federation of Agricultural Cooperatives; 375 Kita-6, Higashi-7 Higashi-ku Sapporo 060-0906 Japan
2. Graduate School of Agriculture; Hokkaido Univ; Kita-21, Nishi-11 Kita-ku, Sapporo Hokkaido 001-0021 Japan
3. Author Okazaki is with Natl. Agricultural and Food Research Organization/Hokkaido Agricultural Research Center; Hitsujigaoka-1 Toyohira-ku, Sapporo Hokkaido 062-8555 Japan
4. Author Shinano is with Natl. Agricultural and Food Research Organization/Hokkaido Agricultural Research Center; Hitsujigaoka-1 Toyohira-ku, Sapporo Hokkaido 062-8555 Japan
5. Natl. Agricultural and Food Research Organization/Tohoku Agricultural Research Center for Fukushima Research Station; 50 Harajukuminami Arai, Fukushima Fukushima 960-2156 Japan