1. Department of Agriculture and Biological Chemistry, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa‐shi, Kanagawa‐ken, 252‐8510 Japan. Phone: +813‐3421‐5429, Fax: +813‐3424‐2264
2. Department of Food Chemistry and Analysis, Institute of Chemical Technology, Prague, Czech Republic