Journal
ANALYTICAL METHODS
Volume 6, Issue 11, Pages 3629-3633Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ay00363b
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAFESP) [2008/57805-2, 2013/22485-6]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [573672/2008-3, 305318/2012-8]
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Analysis of trace elements in virgin olive oil (VOO) is important for nutritional information, geographical characterization, and adulteration detection. In this study, Na+, K+, Ca2+, and Mg2+ in VOO were extracted to an aqueous solution with the aid of ultrasound energy, which was analyzed by capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-(CD)-D-4). The metal ions were separated in less than 3 min with good peak resolutions. The CE-(CD)-D-4 method exhibited good linearity, with coefficients of determination (R-2) ranging from 0.9978 to 0.9995. The limits of quantification for Na+, K+, Ca2+, and Mg2+ were 0.029, 0.029, 0.033, and 0.044 mg kg(-1), respectively. The results of the recovery tests at three concentration levels ranged from 80.5% to 119.6% with a relative standard deviation of 0.6 to 18.1%. The proposed CE-(CD)-D-4 method was successfully applied for determination of the target analytes in five commercial samples of VOO.
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