1. Department of Food Science, Danish Institute of Agricultural Sciences, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark; Center for Advanced Food Studies, Department of Dairy and Food Science, Food Technology, The Royal Veterinary and Agricultural University, Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark; and Centre for Magnetic Resonance, University of Queensland, Queensland 4072, Australia