1. Division
of Chemistry and Biochemistry, Graduate School of Natural Science
and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
2. Mitsubishi-Kagaku Foods Co., 1000 Kamoshida-cho, Aoba-ku, Yokohama, Kanagawa 227-8502, Japan