1. Hamburg
School of Food Science, Institute of Food Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
2. NMR
Facility, Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz
6, 20146 Hamburg, Germany
3. Institute
for Prevention and Cancer Epidemiology, Molecular Preventive Medicine, University of Freiburg−Medical Center, Elsässerstraße 2, 79110 Freiburg, Germany
4. Department
1, Analytical Chemistry; Reference Materials, Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Straße
11, 12489 Berlin, Germany