期刊
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
卷 34, 期 1, 页码 75-80出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jfca.2014.02.008
关键词
Coconut milk; Micronutrient; Trace elements; Mineral content in food; Food analysis; Food composition; Doehlert matrix; Ultrasound-assisted extraction; Multivariate analysis; ICP OES
资金
- Fundacao de Amparo a Pesquisa do Estado da Bahia (FAPESB)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
In this paper, multivariate optimisation was applied to the development of an ultrasound-assisted multi-elemental extraction procedure to measure micronutrient minerals in coconut milk samples by inductively coupled plasma optical emission spectrometry (ICP OES). The factorial and Doehlert designs were applied to optimise the process variables. Using this approach, the optimal experimental condition for 1.0 g of coconut milk was determined: 10 min sonication time; 20.0 mL of HNO3 (1.0 mol L-1); and 5 min centrifugation time at 2000 rpm. The extraction percentage was calculated using the analyte concentration obtained by a total digestion procedure as a reference. Accuracy was assessed by analysing a certified reference material (NIST 1549). The proposed procedure was applied to the analysis of commercial samples of coconut milk, and the resulting concentration ranges, in mu g g(-1), were as follows: 5.8-131 (Ca), <0.27-1.56 (Cu), 0.76-5.52 (Fe), 212-1781 (K), 14.9-201 (Mg), <0.11-3.88 (Mn), 274-625 (Na), 26-341 (P) and <0.74-3.2 (Zn). The method described offers a rapid, easy and efficient sample preparation method for direct determination of micronutrient minerals in coconut milk by ICP OES. (C) 2014 Elsevier Inc. All rights reserved.
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