Sytařová, Irena , Tomas Bata University in Zlín, Faculty of Technology, Department of Food Analysis and Chemistry, nám. T. G. Masaryka 5555, 760 01 Zlín, Czech Republic Szabóová, Renata , Institute of Animal Physiology Slovak Academy of Sciences, Šoltésovej 4-6, 040 01 Košice Szabóová, Renáta , Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, 040 01, Košice Szabóová, Zuzana , Slovak University of Agriculture, Faculty of Biotechnology and Food Sciences, Department of Hygiene and Food Safety, Tr. A. Hlinku 2, 949 76 Nitra Szarka, Katarína, J. Selye University, Faculty of Education, Department of Chemistry, Bratislavská cesta 3322, 945 01 Komárno, Slovakia, Tel.: +421 35 32 60 683 Szarková, Xénia, Slovak University of Agriculture in Nitra, Faculty of Economics and Management, Department of Management, Trieda A. Hlinku 2, 94901 Nitra, Slovakia, Tel.: +421 37 641 4130 Székely, László, Szent István University, Institute of Mathematics and Basic Science, Department of Mathematics, Páter K. u. 1., 2100, Gödöllő, Hungary, Tel.: +3628522000