Y Shibuya1, Y Sugimura1, S Tahara1,2, J Mizutani1,2. 1. a Tochigi Research Laboratories, Kao Corporation, 2606 Akabane, Ichikai-machi , Tochigi 321-34 , Japan. 2. b Department of Agricultural Chemistry, Faculty of Agriculture , Hokkaido University , Kita-ku , Sapporo 060 , Japan.