1. Department of Food Science and Biotechnology; Sungkyunkwan University; Suwon 440-746 Republic of Korea
2. Department of Food and Nutrition; Honam University; Gwangju 506-714 Republic of Korea
3. Biomedical Research Institute; Korea Institute of Science and Technology; Seoul 136-791 Republic of Korea
4. Department of Food Bioscience and Technology; Korea University; Seoul 136-701 Republic of Korea