1. Laboratory of Food Chemistry and Product Design and Quality Management Group, Department of Agrotechnology and Food Science, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands; Institute of Food Chemistry, Technical University Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany; and Unilever Food and Health Research Institute, P.O. Box 114, 3130 AC Vlaardingen, The Netherlands