1. Oil & Fats Research Laboratory; Nippon Oil & Fats Co.; 1-56 Ohamacho, Amagasaki Hyogo 660 Japan
2. ; Department of Agricultural Chemistry, Faculty of Agriculture; Kobe University; Nada-ku Kobe 657 Japan
3. ; Center for Cooperative Research and Development; Kobe University; Nada-ku Kobe 657 Japan