1. Nofima Mat AS, Osloveien 1, N-1430 Ås, Norway
2. Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Avenida de Elvas s/n, 06006 Badajoz, Spain
3. Department of Chemistry, Biotechnology and Food Sciences, Norwegian University of Life Sciences, NO-1432 Ås, Norway.