Simultaneous determination of potassium, sodium, calcium, and magnesium in virgin olive oils by capillary electrophoresis with capacitively coupled contactless conductivity detection

Author(s)

Lemos, M. A. T. ^[1] ; Pinheiro, A. M. ^[2] ; Cassella, R. J. ^[1] ; Jesus, D. P. ^[2]

Affiliation

^[1] Univ Fed Fluminense, Inst Chem, Niteroi, RJ - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: ANALYTICAL METHODS; v. 6, n. 11, p. 3629-3633, JUN 7 2014.
• Web of Science Citations: 9

Abstract

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. (AU)

• FAPESP's process: 13/22485-6 - Development and application of electromembrane extraction in capillary electrophoresis methods
• Grantee: Dosil Pereira de Jesus
• Support Opportunities: Regular Research Grants
• FAPESP's process: 08/57805-2 - Institute of Bioanalytics
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants