1. Department of Dairy, Fat and Cosmetics, Faculty of Food and Biochemical Technology University of Chemistry and Technology Prague Technická 5 Prague 166 28 Czech Republic
2. Department of Agricultural, Food and Nutritional Science University of Alberta 4‐10 Agriculture/Forestry Centre Edmonton AB T6G 2P5 Canada
3. Central Laboratories, Mass Spectrometry University of Chemistry and Technology Prague Technická 5 Prague 166 28 Czech Republic