1. Laboratory of Food Chemistry, Department of Bioscience and Biotechnology, Division of Bioresource and Bioenvironmental Sciences, Graduate School Kyushu University 46-09, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan; Department of Virology, Medical Institute of Bioregulation, Kyushu University 69, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; and Nagoya Factory, Rinol Oil Mills Company, Ltd., 37-15 Shiomi-cho, Minato-ku, Nagoya 455-0028, Japan