1. Rice Research Team, Korea Food Research Institute, Songnam-si, 463-746, Korea.
2. Corresponding author: Phone: 82-31-780-9042. Fax:82-31-780-9059. E-mail: sskim@kfri.re.kr.
3. Optochem Co.Ltd., Seoul, 152-050 Korea.
4. Ricetech Co.Ltd., Songnam-si, 463-746, Korea.