1. Lab. of Food and Nutritional Sciences, Faculty of Chemistry, Materials, and Bioengineering; Kansai Univ; Suita Osaka 564-8680 Japan
2. Dept. of Biotechnology and Environmental Chemistry; Kitami Inst. of Technology; Kitami Hokkaido 090-8507 Japan
3. Dept. of Public Health; Kansai Medical Univ.; Hirakata Osaka 573-1010 Japan