Author/Authors :
Bystrick?، J. نويسنده Department of Chemistry, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic , , ?rvay، J. نويسنده Department of Chemistry, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic , , Musilov?، J. نويسنده Department of Chemistry, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic , , Vollmannov?، A. نويسنده Department of Chemistry, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic , , T?th، T. نويسنده Department of Chemistry, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic , , Lenkov?، M. نويسنده Department of Chemistry, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Tr. A Hlinku 2, 949 76 Nitra, Slovak Republic ,
Abstract :
Onion (Allium cepa L.) is widely used around the world and it is very important vegetable in the
Slovak Republic (SR). Six varieties of onion (Karmen, Kamal, Amika, Hector, Diamant, White Dry) were studied
and the contents of selected heavy metals, their polyphenol contents as well as the possible correlations among
selected heavy metals in soil and onions were analysed. Six soil sampling sites were selected and the analyses of
pH/KCl, P, K, Mg and certain heavy metals (as total and mobile fraction) were provided. The concentrations of
minerals and heavy metalswere determined by atomic absorption spectrophotometry and the content of total
polyphenols was estimated by Folin-Ciocalteau reagent.Results revealed the excess in maximum amounts for
total Cd content, where values ranged from 0.90 to 1.24 mg/kg as well as for mobile form of cadmium and lead
where values were in the range 0.06 - 0.14 mg/kg and 0.6 - 1.07 mg/kg, respectively. The content of three metals
(Cr, Cd, Pb) in the dry matter (DM) of the onions exceeded the limits set by the European Union and Food
Codex of Slovak Republic. Polyphenols concentration varied in the range from 162.84 mg/kg (white variety
Diamant) to 1387.89 mg/kg FW (red variety Kamal).Among the varieties statistically significant differences (P
< 0.05) in intake of heavy metals and in the content of polyphenols were found.
