1. Dept. Nutrition and Food Sciences, Fu-Jen University, Taipei, Taiwan, R.O.C.
2. Dept. Chemistry, Fu-Jen University, Taipei, Taiwan, R.O.C.
3. Corresponding author. Phone: 886-2-29031111 x3627. Fax: 886-2-22093271. E-mail: nutr1000@mails.fju.edu.tw