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Microchimica Acta

, 186:512 | Cite as

A ratiometric electrochemiluminescent tetracycline assay based on the combined use of carbon nanodots, Ru(bpy)32+, and magnetic solid phase microextraction

  • Yunxia Hu
  • Luyao Su
  • Sui WangEmail author
  • Zhiyong Guo
  • Yufang Hu
  • Hongzhen Xie
Original Paper
  • 64 Downloads

Abstract

A method is described for combined magnetic solid phase microextraction and electrochemiluminescent (ECL) detection of the antibiotic tetracycline. A nanocomposite of type Fe3O4@SiO2@ZnO was used as the sorbent. Tetracycline has a strong affinity for Zn(II) ion and therefore is well extracted by this sorbent. The loaded sorbent can be magnetically removed. The extraction efficiency at a 1.0 μM tetracycline concentration is around 88%. Detection is based on the use of carbon nanodots that were prepared form urea and ethylenediaminetetraacetic acid as raw materials. The electrochemical probe Ru(bpy)32+ was added to generate double ECL when scanning the potential between −3.5 and + 2 V. The two ECL signals decreased with the increase of tetracycline concentration. Under optimized experimental conditions, the ratio of the two signals is linearly related to the logarithm of the tetracycline concentration in the range from 1.0 nM to 0.1 mM, with a 0.47 nM detection limit. The method was successfully applied to the determination of tetracycline in spiked milk. It exhibited good sensitivity, selectivity and accuracy due to ratiometric read-out and prior preconcentration of analyte.

Graphical abstract

Tetracycline (TC) has a strong affinity for Zn(II) ion and is well extracted by the Fe3O4@SiO2@ZnO nanocomposite. Ru(bpy)32+ can generate double electrochemiluminescence signals based on the use of carbon nanodots (C-dots) as coreactant. The two signals decrease with the increase of tetracycline concentration. [Ru(bpy)32+]* stands for excited state Ru(bpy)22+.

Keywords

Electrochemiluminescence Ratiometric sensing Determination Nanocomposite Extraction Spiked milk 

Notes

Acknowledgements

Financial support from the National Natural Science Foundation of China (41576098, 81773483), the Science and Technology Department of Zhejiang Province of China (2016C33176, LGF18B070002) and Natural Science Foundation of Ningbo (2017A610231, 2017A610228, 2017A610069) are gratefully acknowledged. This research was also sponsored by K.C. Wong Magna Fund in Ningbo University.

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3611_MOESM1_ESM.docx (4.7 mb)
ESM 1 (DOCX 4.66 mb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • Yunxia Hu
    • 1
  • Luyao Su
    • 1
  • Sui Wang
    • 1
    Email author
  • Zhiyong Guo
    • 1
  • Yufang Hu
    • 1
  • Hongzhen Xie
    • 1
  1. 1.State Key Laboratory for Quality and Safety of Agro-products, School of Material Science and Chemical EngineeringNingbo UniversityNingboPeople’s Republic of China

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