Abstract
A procedure based on magnetic solid-phase extraction followed by capillary electrophoresis (CE) has been developed for the determination of Zn, Cu, Mn and Cd in grape marc spirit samples. Two different sorbents, carboxylic group functionalized silica nanoparticles (Si-COOH-NPs) and multi-walled carbon nanotubes (MWCNTs), were compared. Separation and quantification of the metals by CE were performed after their complexation with phenanthroline. The optimization of variables affecting the extraction procedure was carried out to achieve the best extraction efficiency. Both sorbents yielded quantitative (recoveries in the ranges of 98–102 and 79–92% for Si-COOH-NPs and MWCNTs, respectively), precise (RSD < 7.5%), sensitive (LODs between 0.5–2.2 and 5–9 μg/L for Si-COOH-NPs and MWCNTs, respectively) results with linearity over one order of magnitude. The application of both sorbents for the extraction of metals from grape marc spirit samples with European protected geographical indication Orujo de Galicia showed that carboxylic functionalized silica particles provided the best results. However, MWCNTs remain an attractive alternative sorbent.
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