1. Graduate student, School of Bioresource, College of Natural Science, Andong National University. Current address: Daepyung Co., Ltd., Sangju, Korea.
2. School of Bioresource, College of Natural Science, Andong National University, Andong, Kyungbuk 760-749, Korea.
3. Corresponding author. Phone: 82 54 820 5492. Fax: 82 54 823 1627. E-mail: kmchung@andong.ac.kr
4. Graduate student, Department of Food Science and Technology, School of Agricultural Biotechnology, Seoul National University, Korea.
5. National Laboratory for Functional Food Carbohydrate, School of Agricultural Biotechnology, and Center for Agricultural Biomaterials, Seoul National University, Korea.