1. National Laboratory for Functional Food Carbohydrate, School of Agricultural Biotechnology, and Center for Agricultural Biomaterials, Seoul National University, Seoul 151-742, Korea.
2. School of Bioresource, College of Natural Science, Andong National University, Andong 760-749, Korea.
3. Department of Food Science and Whistler Center for Carbohydrate Research, Purdue University, West Lafayette, IN 47907.
4. Corresponding author. Phone: 82-2-880-4854. Fax: 82-2-873-5095. E-mail: twmoon@snu.ac.kr