1. Division of Applied Chemistry and Biochemistry, National Institute of Technology, Tomakomai College, Nishikioka 443, Tomakomai, Hokkaido 059 1275, Japan
2. Department of Applied Chemistry and Biochemistry, National Institute of Technology, Fukushima College, Nagao 30, Kamiarakawa, Taira, Iwaki, Fukushima 970-8034, Japan
3. Faculty of Food and Agricultural Sciences, Fukushima University, 1 Kanayagawa, Fukushima, Fukushima 960-1296, Japan
4. Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo, Hokkaido 060 8628, Japan