期刊
FOOD CHEMISTRY
卷 111, 期 4, 页码 1012-1015出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2008.04.067
关键词
Brazil nuts; trace elements; lipid fraction; ICP-OES
Major (Ca, Mg, P) and trace (As, Al, Ba, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Se, Zn) elements were determined in Brazil nuts by means of inductively coupled plasma atomic optical spectrometry (ICP-OES) and five of them were measured for the first time. For measurement of As, Hg and Se levels, hydride generation was used as the sample treatment method. The element concentrations were compared with recommended dietary allowances and upper tolerable levels. The distributions of the elements between lipid and lipid-free fractions were investigated with the use of solvent extraction. Two extractants (petroleum ether and chloroform: methanol 2: 1) were applied. Most of the Cr, Fe and Ni contents were found in the lipid fraction, while Ba, Ca, Cu, Mn, P and Zn were mainly bonded with defatted nut residue. Al, Mg, Se, Sr were only present in the defatted fraction. (C) 2008 Elsevier Ltd. All rights reserved.
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