1. Department of Home Economics, Kenmei Women's Junior College, Honmachi, Himeji, Hyogo 670-0012, Japan, Food Chemistry, Graduate School of Human Life Science, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan, and Natural Products Laboratory, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia