1. Department of Food Science and Technology and Functional Food Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
2. Gwangju Center, Korea Basic Science Institute, Gwangju 500-757, Republic of Korea
3. Korea Pear Research Organization, Chonnam National University, Gwangju 500-757, Republic of Korea
4. Department of Horticulture, Chonnam National University, Gwangju 500-757, Republic of Korea