1. Department of Dairy, Fat and Cosmetics, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6-Dejvice. The Czech Republic
2. Dairy Research Institute Ltd., Ke Dvoru 791/12a, 160 00 Prague 6-Vokovice. The Czech Republic
3. Department of Food Preservation, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6-Dejvice. The Czech Republic