INVESTIGADORES
CAMIÑA Jose Manuel
congresos y reuniones científicas
Título:
Classification Of Milk Samples Based On Their Elemental Composition. Inductively Coupled Plasma Mass Spectrometry Determination After Single-Step Solubilization With N,N-Dimethylformamide
Autor/es:
M. SAVIO; S. M. AZCÁRATE; P. SMICHOWSKI; J.M. CAMIÑA; L.D. MARTÍNEZ; R.A. GIL
Lugar:
Mérida
Reunión:
Simposio; 13º Rio Symposium on Atomic Spectrometry; 2014
Institución organizadora:
Universidad Autónoma de Yucatán
Resumen:
A single-step procedure for trace elemental analysis of milk samples is presented. Solubilization with dymethylformamide (DMF) was assayed prior to inductively coupled plasma mass spectrometry (ICPMS) detection with a high efficiency sample introduction system. Small amounts of DMF were used with soft heating and dilution with ultrapure water, resulting in high elemental concentrations due to low dilution factors. All main instrumental conditions were optimized in order to readily introduce the samples without matrix elimination. In order to assess and mitigate matrix effects in the determination of As, Cd, Co, Cu, Eu, Ga, Gd, Ge, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Sm, S, Sr, Ta, Tb, V, Zn, and Zr, matrix matching calibration with 103Rh+ as internal standard (IS) was performed. The obtained limits of detection were between 0.68 (Tb) and 30 (Zn) mg/L. For accuracy verification, certified Skim milk powder reference material (BCR 063R) was employed. The developed method was applied to trace elemental analysis of milks commercially available. Principal components analysis was used to correlate the content of trace metals with the kind of milk, obtaining a classification according to adults, baby or baby fortified milks. This is a simple and fast approach for quality control, traceability and routine analysis of milks. References: [1] World Health Organization, Evaluation of Certain Food Additives and Contaminants, Geneva, Switzerland: WHO Technical Report Series 930 (2006). [2] A. Ataro, R.I. McCrindle, B.M. Botha, C.M.E. McCrindle, P.P. Ndibewu, Quantification of trace elements in raw cows milk by inductively coupled plasma mass spectrometry (ICP-MS), Food Chemistry, 111 (2008) 243-248. [3] A.W. Boorn, R.F. Browner, Effects of organic solvents in inductively coupled plasma atomic emission spectrometry, Analytical Chemistry, 54 (1982) 1402-1410.  [4] M. Forina, M. Casale, P. Oliveri, Application of Chemometrics to Food Chemistry, in: S.D. Brown, R. Tauler, B. Walczak (Eds.) Comprehensive Chemometrics, Elsevier, Oxford, 2009, pp. 75-128. Acknowledgements The authors thank to Instituto de Quimica de San Luis from the Universidad Nacional de San Luis, Instituto de Ciencias de la Tierra y Ambientales de La Pampa (INCITAP) from the Universidad Nacional de La Pampa, Consejo Nacional de Investigaciones Cientificas y Tecnicas (CCT-San Luis), and Agencia Nacional de Promocion Cientifica (FONCYT) for financial support.