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Abstract

The application of layered double hydroxide-Al2 O3 -polymer mixed-matrix disks for solid-phase extraction is reported for the first time. Al2 O3 is embedded in a polymer matrix followed by an in situ metal-exchange process to obtain a layered double hydroxide-Al2 O3 -polymer mixed-matrix disk with excellent flow-through properties. The extraction performance of the prepared disks is evaluated as a proof of concept for the automated extraction using sequential injection analysis of organic acids (p-hydroxybenzoic acid, 3,4-dihydroxybenzoic acid, gallic acid) following an anion-exchange mechanism. After the solid-phase extraction, phenolic acids were quantified by reversed-phase high-performance liquid chromatography with diode-array detection using a core-shell silica-C18 stationary phase and isocratic elution (acetonitrile/0.5% acetic acid in pure water, 5:95, v/v). High sensitivity and reproducibility were obtained with limits of detection in the range of 0.12-0.25 μg/L (sample volume, 4 mL), and relative standard deviations between 2.9 and 3.4% (10 μg/L, n = 6). Enrichment factors of 34-39 were obtained. Layered double hydroxide-Al2 O3 -polymer mixed-matrix disks had an average lifetime of 50 extractions. Analyte recoveries ranged from 93 to 96% for grape juice and nonalcoholic beer samples.

Item Type:	Article
Authors/Creators:	Ghani, M and Cabello, CP and Saraji, M and Estela, JM and Cerda, V and Palomino, GT and Maya, F
Keywords:	membranes, chromatography, automated sample treatment, high-performance liquid chromatography, layered double hydroxides, phenolic acids, solid-phase extraction
Journal or Publication Title:	Journal of Separation Science
Publisher:	Wiley - V C H Verlag GmbH and Co. KGaA
ISSN:	1615-9306
DOI / ID Number:	https://doi.org/10.1002/jssc.201701420
Copyright Information:	Copyright 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Related URLs:	Google Scholar: Maya, F
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