1. Centre for Biospectroscopy and Data Modelling, Matforsk AS, Norwegian Food Research Institute, Osloveien 1, N-1430 Ås, Norway, Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432 Ås, Norway, and Department of Food Science, Danish Institute of Agricultural Sciences, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark