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Analytical and Bioanalytical Chemistry

, Volume 411, Issue 4, pp 905–913 | Cite as

An ultrasensitive signal-on electrochemiluminescence biosensor based on Au nanoclusters for detecting acetylthiocholine

  • Cong Zhang
  • Yu Fan
  • Han Zhang
  • Shihong ChenEmail author
  • Ruo Yuan
Research Paper
  • 112 Downloads

Abstract

For improving the sensitivity of the electrochemiluminescent (ECL) detection and extending the applications of luminophore, the development of coreactant accelerator is one of the important ways. In this work, Au nanoclusters (Au NCs) were chosen as the luminescent material, and thiocholine, which was in situ generated by enzymatic reaction, was found to serve as a coreactant accelerator for Au NC-S2O82− ECL system. Based on this discovery, a highly sensitive detection of acetylthiocholine (ATCl) was achieved using the acetylcholinesterase (AChE) biosensor. CeO2 nanowires (CeO2 NWs) were used to improve the stability of Au NCs on the glassy carbon electrode (GCE) due to the large specific surface area and good film-forming properties of CeO2 NWs. ATCl was catalyzed by acetylcholinesterase (AChE) to produce thiocholine, which served as the coreactant accelerator to improve the ECL signal of Au NC-S2O82− system. The biosensor obtained a low detection limit of 0.17 nM. The integration of thiocholine and Au NCs would provide a new ECL platform for bioanalysis.

Graphical abstract

Keywords

Electrochemiluminescence Biosensor Au nanoclusters Acetylthiocholine Thiocholine 

Notes

Funding information

This work was supported by National Natural Science Foundation of China (21775122, 21775123, 51473136, 21575116) and Nature Science Foundation of Chongqing City (cstc2018jcyjAX0693) China.

Compliance with ethical standards

Informed consent

The 9th People’s Hospital of Chongqing Committee approved our studies, and all volunteers gave informed consent.

Conflict of interest

The authors declare that they have no conflict interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Cong Zhang
    • 1
  • Yu Fan
    • 1
  • Han Zhang
    • 1
  • Shihong Chen
    • 1
    Email author
  • Ruo Yuan
    • 1
  1. 1.Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical EngineeringSouthwest UniversityChongqingChina

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