1. School of Food Science and Biotechnology; Kyungpook National University; Daegu 41566 Korea
2. Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute; Jeongeup 56212 Korea
3. Experiment Research Institute, National Agricultural Products Quality; Gimcheon 39660 Korea
4. Department of Food Science and Technology; Keimyung University; Daegu 42601 Korea