Magnetic hollow bimetallic zinc/cobalt zeolitic imidazolate framework as sorbent for efficiently enriching aflatoxins co
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ORIGINAL PAPER
Magnetic hollow bimetallic zinc/cobalt zeolitic imidazolate framework as sorbent for efficiently enriching aflatoxins combined with UHPLC-IT-MSn determination Zelan Wang 1 & Zhe Meng 1
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Mengxin Zhao 1 & Xiuqin Men 1 & Jinhui Yang 1 & Jiguang Li 1
Received: 30 April 2020 / Accepted: 27 August 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A novel magnetic hollow bimetallic zinc/cobalt-based zeolitic imidazolate framework (MHB-Zn/Co-ZIF-8) was prepared via a microwave-assisted chemical etching in methanol. The structure, morphology, and specific surface area were characterized by Xray diffraction and FTIR spectroscopy, scanning and transmission electron microscopy, and N2 adsorption. The hollow nanostructures with high internal specific surface area, abundant active sites, and reduced aggregation of nanoparticles endow the hollow zeolitic imidazolate framework (ZIF) nanoparticle with high chemical stability, desirable durability, and excellent adsorption abilities. The MHB-Zn/Co-ZIF-8 nanoparticle was used as an effective sorbent for magnetic solid-phase extraction (MSPE) of trace aflatoxins B1, B2, G1, and G2 from fruit juice and fruit samples. The main parameters affecting the efficiency of MSPE procedures were investigated and optimized. The results show that, under optimized conditions, enrichment factors ranging from 67- to 355-fold are obtained for the target analytes. The method is linear in the range 1.0 to 100.0 ng mL−1 with correlation coefficients (R2) from 0.9960 to 0.9992. The limits of detection of four aflatoxins are in the range 0.18 to 1.50 ng mL−1 and the average recoveries range from 75.1 to 102.4%, with relative standard deviations (RSDs) less than 13.6%. This work presents the excellent extraction performance of aflatoxins B1, B2, G1, and G2 on MHB-Zn/Co-ZIF-8. In addition, the applicability of the MSPE coupling with ultrahigh-performance liquid chromatography-ion trap tandem mass spectrometry (UHPLC-IT-MSn) for trace analysis in complex matrices is shown. Keywords Aflatoxins . Fruit juice . Magnetic solid-phase extraction (MSPE) . Zeolitic imidazolate framework . Hollow cavity structures
Introduction Aflatoxins (AFs) are highly toxic secondary metabolites produced from a wide range of fungal species such as Aspergillus flavus and Aspergillus parasiticus [1]. There are at least 20 Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04533-y) contains supplementary material, which is available to authorized users. * Zhe Meng [email protected] * Jinhui Yang [email protected] 1
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
mycotoxins with similar chemical structures growing on naturally in a variety of foods, such as fruits, cereals, corn, nuts, spices, and peanut products. These mycotoxins are not destroyed by conventional industrial processing or cooking becaus
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