1. Research Center Maruzen Pharmaceuticals Co., Ltd. Fukuyama Hiroshima 729‐3102 Japan
2. Laboratory of Molecular Function of Food Division of Food Science and Biotechnology Graduate School of Agriculture Kyoto University Uji Kyoto 611‐0011 Japan
3. Laboratory of Nutrition Chemistry Faculty of Home Economics Kobe Women's University Suma‐ku Kobe Hyogo 654‐8585 Japan
4. Research Unit for Physiological Chemistry C‐PIER Kyoto University Kyoto 606‐8501 Japan