1. National Agricultural Research Center for Kyushu Okinawa Region, National Agricultural Research Organization (KONARC/NARO), Nishigoshi, Kikuchi, Kumamoto 861-1192, Japan; Miyazaki JA Food Research and Development Inc., Ikimedai-Nishi, Miyazaki 880-0943, Japan; and Department of Food Science and Technology, College of Horticulture, Minami-Kyushu University, Hibarigaoka, Takanabe, Miyazaki 884-0003, Japan