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Microchimica Acta

, 186:467 | Cite as

Colorimetric determination of cytosine-rich ssDNA by silver(I)-modulated glucose oxidase-catalyzed growth of gold nanoparticles

  • Bo-Wen Liu
  • Yang-Yang Wu
  • Peng-Cheng HuangEmail author
  • Fang-Ying WuEmail author
Original Paper
  • 72 Downloads

Abstract

A colorimetric assay is described for determination of cytosine-rich ssDNA at physiological pH values. The working principle is based on (a) Ag(I) ion-induced formation of an i-motif structure, and (b) glucose oxidase-controlled growth of gold nanoparticles (AuNPs). The combination between Ag+ and cytosine-rich DNA can modulate the generation of H2O2 resulting from enzyme catalyzed glucose oxidation. Depending on the amount of H2O2 formed, the solution containing the AuNPs will turn red in the presence of cytosine-rich ssDNA but blue in the absence of such DNA if Ag+ is added before the formation of the red AuNPs. Upon addition of C-DNA at different concentrations, the peak shift (Δλ) of the AuNP solution relative to the SPR peak position (560 nm) in the absence of C-DNA is taken as the signal readout. The method shows a good linear response toward C-DNA over the range 10–200 nM with a detection limit of 2.7 nM. It may also be performed visually. The photometric assay is highly sensitive, specific, and rapid. The method is particularly attractive in terms of applications such as in human serum analysis, a colorimetric logic gate, and the calculation of binding constants for the interaction between Ag+ and glucose oxidase (GOx), and between Ag+ and cytosine-rich ssDNAs.

Graphical abstract

Schematic presentation of colorimetric detection of cytosine (C)-rich ssDNA (C-DNA) based on the modulation of the glucose oxidase (GOx)-catalyzed growth of gold nanoparticles (AuNPs) with Ag+ as the enzyme inhibitor.

Keywords

I-motif structure Surface plasmon resonance Enzymatic activity Peak shift Dixon plot Human serum Logic gate Binding constants H2O2 Transmission electron microscopy 

Notes

Acknowledgements

This work was financially supported by National Natural Science Foundation of China (No. 21765014, 21864018, and 21505067).

Compliance with ethical standards

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

Supplementary material

604_2019_3591_MOESM1_ESM.doc (1.1 mb)
ESM 1 (DOC 1094 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.College of ChemistryNanchang UniversityNanchangChina

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