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Elemental analysis of nuts and seeds by axially viewed ICP OES.pdf

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Food Chemistry 124 (2011) 1667–1672 Contents lists available at ScienceDirect Food Chemistry journal homepage: /locate/foodchem Analytical Methods Elemental analysis of nuts and seeds by axially viewed ICP OES Juliana Naozuka a, Edivan Carvalho Vieira b, Angerson Nogueira Nascimento c, Pedro Vitoriano Oliveira c,* a Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-170 Santo André, SP, Brazil b Departamento de Química, Universidade Federal do Piauí, 64049-500 Teresina, PI, Brazil c Instituto de Química, Universidade de S?o Paulo, C.P. 26077, 05513-970 S?o Paulo, SP, Brazil article info Article history: Received 3 August 2009 Received in revised form 14 July 2010 Accepted 18 July 2010 Keywords: Elemental analysis ICP OES Emission spectrometry Nuts Seeds abstract A method for the multi-elemental determination of metals (Al, Ba, Ca, Cu, Fe, K, Mg, Mn, Sr and Zn), metalloids (B and Si), and non-metals (Cl, P and S) in the babassu nut and mesocarp, sapucaia nut, coconut pulp, cupuassu pulp and seed, and cashew nut by axially viewed inductively coupled plasma optical emission spectrometry is presented. A diluted oxidant mixture (2 ml HNO3 + 1 ml H2O2 + 3 ml H2O) was used to achieve the complete decomposition of the organic matrix in a closed-vessel microwave oven. The accuracy of the entire proposed method was con?rmed by standard reference material analysis (peach leaves-NIST SRM1547). The certi?ed values showed a good agreement at a 95% con?dence limit (Student’s t-test). The average RSD for repeatability of calibration solutions measurements were in the range of 1.1–6.7%. Limits of quanti?cation (LOQ = 10 ? LOD) were in the level of 0.00072–0.0532 mg/l. The macro and micronutrient ranges in the different nuts and seeds did not exceed the dietary reference intake (DRI), except for Mn in the babassu nut. ó 2010 Published by Elsevier Ltd. 1. Introduction In recent years nuts from the Amazon region have attracted attention due to the high concentrat