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Selective fluorescence response and magnetic separation probe for 2,4,6-trinitrotoluene based on iron oxide magnetic nanoparticles

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Abstract

Despite the rapid development of nanomaterials and nanotechnology, it is still desirable to develop novel nanoparticle-based techniques which are cost-effective, timesaving, and environment-friendly, and with ease of operation and procedural simplicity, for assay of target analytes. In the work discussed in this paper, the dye fluorescein isothiocyanate (FITC) was conjugated to 1,6-hexanediamine (HDA)-capped iron oxide magnetic nanoparticles (FITC–HDA Fe3O4 MNPs), and the product was characterized. HDA ligands on the surface of Fe3O4 MNPs can bind 2,4,6-trinitrotoluene (TNT) to form TNT anions by acid–base pairing interaction. Formation of TNT anions, and captured TNT substantially affect the emission of FITC on the surface of the Fe3O4 MNPs, resulting in quenching of the fluorescence at 519 nm. A novel FITC–HDA Fe3O4 MNPs-based probe featuring chemosensing and magnetic separation has therefore been constructed. i.e. FITC–HDA Fe3O4 MNPs had a highly selective fluorescence response and enabled magnetic separation of TNT from other nitroaromatic compounds by quenching of the emission of FITC and capture of TNT in aqueous solution. Very good linearity was observed for TNT concentrations in the range 0.05–1.5 μmol L−1, with a detection limit of 37.2 nmol L−1 and RSD of 4.7 % (n = 7). Approximately 12 % of the total amount of TNT was captured. The proposed methods are well-suited to trace detection and capture of TNT in aqueous solution.

Iron oxide magnetic nanoparticles-based selective fluorescent response and magnetic separation probe for 2,4,6-trinitrotoluene

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Acknowledgments

This work was supported by the Doctor Foundation (2012) and the College Students’ Science and Technology Innovation Fund (C12073 and C10047) of Anhui University of Architecture. The authors also thank the National Natural Science Foundation of China (21201005, 21171004) and Anhui Natural Science Foundation (KJ2012Z052) for financial support.

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Authors and Affiliations

  1. School of Materials and Chemical Engineering and Anhui Key Laboratory of Advanced Building Materials, Anhui University of Architecture, 856 South Jinzhai Road, Hefei, 230022, China

    Wen-Sheng Zou, Ya-Qin Wang, Feng Wang, Qun Shao, Jun Zhang & Jin Liu

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  1. Wen-Sheng Zou
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  2. Ya-Qin Wang
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  3. Feng Wang
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  4. Qun Shao
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  5. Jun Zhang
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  6. Jin Liu
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Correspondence to Wen-Sheng Zou.

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Zou, WS., Wang, YQ., Wang, F. et al. Selective fluorescence response and magnetic separation probe for 2,4,6-trinitrotoluene based on iron oxide magnetic nanoparticles. Anal Bioanal Chem 405, 4905–4912 (2013). https://doi.org/10.1007/s00216-013-6873-6

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  • DOI: https://doi.org/10.1007/s00216-013-6873-6

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