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Magnetic cobalt-nitrogen-doped carbon microspheres for the preconcentration of phthalate esters from beverage and milk samples

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Abstract

The authors describe the preparation of magnetic cobalt/nitrogen-doped carbon microspheres (Co-N/Cs) by combining a hydrothermal procedure with a carbonization process. The textures of the Co-N/Cs were investigated by powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, nitrogen adsorption-desorption isotherms and vibration sample magnetometry. The Co-N/Cs possess a high surface area and strong magnetism. This results in good adsorption capability and enables magnetic separation. The Co-N/Cs are shown to be an effective magnetic solid-phase extraction adsorbent for the enrichment of various phthalate esters (diethyl phthalate, diallyl phthalate and diisobutyl phthalate) from sport beverages and milk samples prior to their determination by HPLC. The limits of detection (at an S/N ratio of 3) are between 0.1–0.2 and 0.08–0.3 ng mL−1 for sport beverages and milk samples, respectively. The recoveries when extracting all the spiked samples varied from 80.3% to 116.2%.

Magnetic cobalt/nitrogen-doped carbon microspheres (Co-N/Cs) were prepared and used as an effective magnetic solid phase extraction adsorbent for the enrichment of phthalate esters from beverages and milk samples.

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Authors and Affiliations

  1. College of Science, Agricultural University of Hebei, Baoding, Hebei, 071001, China

    Caina Jiao, Menghua Li, Lin Hao, Chun Wang, Qiuhua Wu & Zhi Wang

  2. College of Landscape and Travel, Hebei Agricultural University, Baoding, 071001, China

    Ruiyang Ma

Authors
  1. Caina Jiao
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  4. Lin Hao
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  5. Chun Wang
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  7. Zhi Wang
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Correspondence to Qiuhua Wu or Zhi Wang.

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Caina Jiao, Ruiyang Ma, Menghua Li, Chun Wang, Qiuhua Wu, and Zhi Wang declare that they have no conflict of interest. This article does not contain any studies with human or animal subjects.

Funding

This study was funded by the National Natural Science Foundation of China (31,571,925, 31,471,643, 31,671,930), and the Hebei “Double First Class Discipline” Construction Foundation for the Discipline of Food Science and Engineering of Hebei Agricultural University (2016SPGCA18), the Natural Science Foundation of Hebei Provinces (B2016204136), and the Scientific and Technological Research Foundation of the Department of Education of Hebei Province (ZD2016085).

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Jiao, C., Ma, R., Li, M. et al. Magnetic cobalt-nitrogen-doped carbon microspheres for the preconcentration of phthalate esters from beverage and milk samples. Microchim Acta 184, 2551–2559 (2017). https://doi.org/10.1007/s00604-017-2251-y

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  • DOI: https://doi.org/10.1007/s00604-017-2251-y

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