1. Department of Food Science and Technology, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 143-747, Korea; Department of Food Science and Technology, Seoul National University of Technology, 172 Gongneung 2-Dong, Nowon-Gu, Seoul 139-743, Korea; and Department of Food and Nutrition, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea