1. Division of Applied Life Science (Brain Korea 21 program), Graduate School of Gyeongsang National University, Chinju, Gyeongnam 660-701, Korea, Laboratory of Food Analysis, Group of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraa 72, 9000 Ghent, Belgium, and Divison of Chemical Enzymology, Faculty of Chemistry, M. V. Lomonosov Moscow State University, 119992 Moscow, Russia