1. Dept. of Biotechnology, College of Life Sciences and BiotechnologyKorea Univ. Seoul 02841 Republic of Korea
2. Dept. of Food Science and TechnologyUniv. of California‐Davis Davis CA 95616 USA
3. Div. of Environmental Science and Ecological EngineeringKorea Univ. Seoul 02841 Republic of Korea
4. Dept. of Food Biosciences and Technology, College of Life Sciences and BiotechnologyKorea Univ. Seoul 02841 Republic of Korea