1. Faculty of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852, Japan
2. Center for Instrumental Analysis, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852, Japan
3. Department of Biotechnology, Faculty of Engineering, Tottori University, Koyama, Tottori 680, Japan