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In-syringe dispersive μ-SPE of estrogens using magnetic carbon microparticles obtained from zeolitic imidazolate frameworks

Gonzales, A, Avivar, J, Maya, F ORCID: 0000-0003-1458-736X, Cabello, CP, Palomino, GT and Cerda, V 2017 , 'In-syringe dispersive μ-SPE of estrogens using magnetic carbon microparticles obtained from zeolitic imidazolate frameworks' , Analytical and Bioanalytical Chemistry, vol. 409, no. 1 , pp. 225-234 , doi: 10.1007/s00216-016-9988-8.

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Abstract

Herein, we propose for the first time the use of magnetic porous carbons (MPCs) derived from zeolitic imidazolate frameworks (ZIFs) for the automated in-syringe magnetic dispersive micro-solid phase extraction (D-μ-SPE) of environmental pollutants prior to their analysis using GC-MS. MPCs with dual porosity are obtained from the direct combustion of the ZIF-67, obtaining robust and magnetic porous carbons on the micrometer scale. As proof of concept, this material has been applied for the automated D-μ-SPE of estrogens (estrone, 17β-estradiol, and 17α-ethynylestradiol) cataloged as Contaminants of Emergent Concern by the Environmental Protection Agency of the United States (US-EPA). The automation of the system provided a good precision given the low relative standard deviations (RSDs) obtained, ranging from 2.70 to 5.90 % for intra-day precision and from 4.6 to 9.55 % for inter-day precision. Furthermore, the clean-up and preconcentration of the sample is easy and quick, as the in-syringe magnetic D-μ-SPE is carried out in less than 20 min. The high porosity, magnetism, and good stability of the MPCs facilitated the automation of the SPE in dispersive mode enabling the analysis of samples with a complex matrix without backpressure or problems related with the clogging of the instrumentation conduits. The applicability of the method to wastewater samples has been demonstrated given the good recoveries attained ranging from 86 to 115 %.

Item Type: Article
Authors/Creators:Gonzales, A and Avivar, J and Maya, F and Cabello, CP and Palomino, GT and Cerda, V
Keywords: microextraction, chromatography, dispersive microsolid phase extraction, magnetic porous carbons, zeolitic imidazolate frameworks, automation, gas chromatography–mass spectrometry, estrogens
Journal or Publication Title: Analytical and Bioanalytical Chemistry
Publisher: Springer-Verlag Heidelberg
ISSN: 1618-2642
DOI / ID Number: 10.1007/s00216-016-9988-8
Copyright Information:

Copyright 2016 Springer-Verlag Berlin Heidelberg

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