1. German Research Center for Food Chemistry, Lise-Meitner-Strasse 34, D-84354 Freising, Germany
2. Institute of Nutritional Physiology, Federal Research Centre for Nutrition and Food, Haid-und-Neu-Strasse 9, D-76131 Karlsruhe, Germany
3. Department of Nutritional and Physiological Chemistry, University of Vienna, Althanstrasse 14 (UZA II), A-1090 Vienna, Austria