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Microchimica Acta

, 186:862 | Cite as

DNA-scaffold copper nanoclusters integrated into a cerium(III)-triggered Fenton-like reaction for the fluorometric and colorimetric enzymatic determination of glucose

  • Hui Li
  • Yuexiang Lu
  • Jiawei Pang
  • Jingwei Sun
  • Fengyi Yang
  • Ziyi Wang
  • Yueying LiuEmail author
Original Paper
  • 80 Downloads

Abstract

A fluorometric and colorimetric method are described for the determination of hydrogen peroxide and glucose by integrating copper nanoclusters (CuNCs) into a Fenton-like reaction. The mechanism mainly depends on the fast formation of long-strand DNA-templated CuNCs with strong red fluorescence (with excitation/emission maxima at 340/640 nm) in the absence of H2O2. The DNA can be cleaved into short-oligonucleotide fragments by hydroxy radicals as formed in the Ce(III)-triggered Fenton-like reaction in the presence of H2O2. As a result, short-strand DNA loses the ability as a template for the formation of CuNCs. This leads to a decrease of fluorescence. The colorimetric assay, in turn, is based on the oxidation of colorless Ce(III) ions to the distinctly yellow Ce(IV) ions (with an absorption maximum at 400 nm) by H2O2. Compared with those assays based on the use of enzyme mimics, this method does not require any chromogenic substrates such as ABTS and TMB. Based on the dual-signal readout platform, we successfully achieved the detection of H2O2 and glucose. LODs are as low as 0.266 μM and 2.92 μM. The methods were applied to the sensitive determination of glucose by using glucose oxidase (GOx) which catalyzes the oxidization of glucose to produce H2O2. The practical application was demonstrated by determination of glucose in human serum, with apparent recoveries of 98.4–101.9% and 99.1–105.6%, respectively. The concentration of glucose ranges from 1 to 500 μM and 50 to 600 μM based on the dual-signal readout platform, respectively. This fluorometric and colorimetric dual-mode strategy will pave a new avenue for constructing effective assays for H2O2-related analytes in biochemical and clinical applications.

Graphical abstract

Schematic representation of a fluorometric and colorimetric dual-readout strategy for the sensitive determination of hydrogen peroxide and glucose. The assay has been designed by integrating copper nanoclusters into a Ce(III)-triggered Fenton-like reaction.

Keywords

DNA-templated CuNCs Fenton-like reaction Dual-signal readout Glucose assay Enzymatic reaction Polythymine Glucose oxidase Hydroxyl radical Visual detection 

Notes

Acknowledgments

The authors gratefully acknowledge the National Natural Science Foundation of China (Grant No. 21775087), Beijing Natural Science Foundation (Grant No. 2162010), and Scientific Research Project of Beijing Educational Committee (Grant No. KM201610028008), and Cross-Disciplinary Research Project of Capital Normal University.

Compliance with ethical standards

Conflict of interest

The authors declare no competing financial interest.

Supplementary material

604_2019_4008_MOESM1_ESM.docx (538 kb)
ESM 1 (DOCX 537 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.Department of ChemistryCapital Normal UniversityBeijingPeople’s Republic of China
  2. 2.Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Beijing Key Lab of Radioactive Waste TreatmentTsinghua UniversityBeijingPeople’s Republic of China

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