1. United Graduated School of Agricultural Sciences, Kagoshima University, 1-21-4, Korimoto, Kagoshima 890-0065, Japan.
2. Department of Biochemical Science and Technology, Faculty of Agriculture, Kagoshima, University 1-21-4, Korimoto, Kagoshima 890-0065, Japan.
3. Takenouchi Barley Processing Inc., 4-12-4, Nanei, Kagoshima 891-0122, Japan.
4. Corresponding author. E-mail: takeda@chem.agri.kagoshima-u.ac.jp. Phone/Fax: +81-99-285-8641.