1. Department of Food Science and Technology, University of Georgia, Athens, Georgia 30602, Department of Food Science and Technology, College of Agriculture, Chungnam National University, Daejeon, Korea, Department of Food Science and Technology, Kyung Pook National University, Korea, and Department of Food and Nutrition, Chungnam National University, 220 Gung-Dong, Yusung-Gu, Daejeon 305-764, Korea