1. Dept. of Food and NutritionSookmyung Women's Univ. Seoul 04310 Korea
2. Dept. of Agricultural Biotechnology, Center for Food and Bioconvergence, and Research Inst. of Agriculture and Life ScienceSeoul National Univ. Seoul 08826 Korea
3. Risk Analysis Research CenterSookmyung Women's Univ. Seoul 04310 Korea