Please use this identifier to cite or link to this item: https://hdl.handle.net/10953/3248
Title: Use of dispersive liquid–liquid microextraction for the determination of carbamates in juice samples by sweeping-micellar electrokinetic chromatography
Authors: Moreno-González, David
Gámiz-Gracia, Laura
García-Campaña, Ana M.
Bosque-Sendra, Juan Manuel
Abstract: Dispersive liquid–liquid microextraction (DLLME) has been proposed for the extraction and preconcentra- tion of 12 carbamate pesticides in juice samples, followed by their determination by micellar electrokinetic chromatography with diode-array detection. To improve sensitivity, an on-capillary sample concentration method based on sweeping has been developed. Also, separations were performed in an extended light path fused-silica capillary; the separation buffer consisted of 100 mM borate and 50 mM SDS (pH 9.0) with 5% acetonitrile. Samples were introduced by hydrodynamic injection, dissolved in the separation buffer, but free of micelles. Several parameters of the DLLME procedure (such as type and volume of extraction and dispersive solvents, pH, salt addition, and extraction time) were optimized. Recoveries obtained for fortified juice samples (banana, pineapple, and tomato) at three different concentration levels, ranged from 78% to 105%, with relative standard deviations lower than 9%. The limits of detection ranged from 1 to 7 μg l−1. Moreover, the method is fast, simple, and environmentally friendly.
Keywords: Micellar electrokinetic chromatography (MEKC)
Carbamates
Sweeping
Dispersive liquid–liquid microextraction (DLLME)
Issue Date: 31-Jan-2011
Publisher: Springer
Appears in Collections:DQFA-Artículos

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