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Título

Analysis of pesticides in soy milk combining solid-phase extraction and capillary electrophoresis-mass spectrometry

AutorHernández Borges, Javier; Rodríguez Delgado, Miguel A.; García-Montelongo, Francisco J.; Cifuentes, Alejandro
Palabras claveCapillary electrophoresis
mass spectrometry
CE-MS
triazolopyrimidine sulfoanilide herbicides
Experimental design
Pesticides
Solid phase extraction
Fecha de publicaciónjun-2005
EditorWiley-VCH
CitaciónJournal of Separation Science, vol. 28, no 9-10 (322 p.), pp. 948-956
ResumenIn this work, the determination of a group of triazolopyrimidine sulfoanilide herbicides (cloransulam-methyl, metosulam, flumetsulam, florasulam and diclosulam) in soy milk by capillary electrophoresis-mass spectrometry (CE-MS) is presented. The main electrospray interface (ESI) parameters (nebulizer pressure, dry gas flow rate, dry gas temperature and composition of the sheath liquid) are optimized using a central composite design. To increase the sensitivity of the CE-MS method, an off-line sample preconcentration procedure based on solid-phase extraction (SPE) is combined with an on-line stacking procedure (i.e. normal stacking mode, NSM). Samples could be injected up to 100 seconds, providing limits of detection (LODs) down to 74 μg/L, i.e., in the low ppb level, with relative standard deviation values (RSD, %) between 3.8% and 6.4% for peak areas for the same day, and between 6.5% and 8.1% for three different days. The usefulness of the optimized SPE-NSM-CE-MS procedure is demonstrated through the sensitive quantification of the selected pesticides in soy milk samples.
Versión del editorhttp://dx.doi.org/10.1002/jssc.200500014
URIhttp://hdl.handle.net/10261/12167
DOI10.1002/jssc.200500014
ISSN1615-9306
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