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Synthesis of cobalt-based magnetic nanoporous carbon core-shell molecularly imprinted polymers for the solid-phase extraction of phthalate plasticizers in edible oil

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Abstract

In this work, cobalt magnetic nanoporous carbon (Co-MNPC) is employed as an alternative to intensively used Fe3O4 cores for the preparation of magnetic molecularly imprinted polymers (Co-MNPC@MIPs) for the first time. Co-MNPC was prepared by one-step carbonization of Zeolitic Imidazolate Framework-67 (ZIF-67). Compared with the traditional Fe3O4 core, Co-MNPC showed a high specific surface area and large pore volumes. The prepared adsorbents, which could be rapidly collected from a matrix by external magnetic field, were applied for solid-phase extraction of phthalate plasticizers in edible oil. Several requisite extraction parameters were optimized to achieve desired extraction performance. Under the optimum extraction conditions, Co-MNPC@MIPs displayed better performance than commercialized columns. An analysis method based on Co-MNPC@MIPs coupled with gas chromatography (GC) was established. The linear range was 1–150 μg mL−1, and the detection limit range was 0.010–0.025 μg mL−1. The spiked recovery rate of the five phthalate plasticizers was 81.6–102.2%, with a relative standard deviation of 3.25–12.02%. Finally, the proposed method showed good feasibility for phthalate plasticizer extraction from edible oil.

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Funding

This study received financial support from the following research funds: National Natural Science Foundation of China (21575034, 51502079, 21577031, 21775140), the Fundamental Research Funds for the Henan Provincial Colleges and Universities in Henan University of Technology (2017RCJH10).

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Authors and Affiliations

  1. School of Chemical Engineering and Environment, Henan University of Technology, Zhengzhou, 450001, Henan, China

    Chaojun Wu, Juan He, Ningning Chen, Yuanyuan Li, Linlin Yuan, Dongxin Zhao, Lijun He & Keren Gu

  2. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Shusheng Zhang

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  1. Chaojun Wu
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  2. Juan He
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  3. Ningning Chen
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  4. Yuanyuan Li
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Correspondence to Juan He.

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Wu, C., He, J., Chen, N. et al. Synthesis of cobalt-based magnetic nanoporous carbon core-shell molecularly imprinted polymers for the solid-phase extraction of phthalate plasticizers in edible oil. Anal Bioanal Chem 410, 6943–6954 (2018). https://doi.org/10.1007/s00216-018-1299-9

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  • DOI: https://doi.org/10.1007/s00216-018-1299-9

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