1. Food & Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, National Agricultural Research Center for Tohoku Region, Fukushima 960-2156, Minato Pharmaceutical Company, Tokyo 104-0061, Aizuwakamatsu Technical Support Centre, Fukushima Technology Centre, Aizuwakamatsu 965-0006, and Department of Medicine, Nippon Medical School, Tokyo 113-8603, Japan