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Microchimica Acta

, 186:242 | Cite as

Molecular machine and gold/graphene quantum dot hybrid based dual amplification strategy for voltammetric detection of VEGF165

  • Chu Hongxia
  • Li ZaijunEmail author
  • Li RuiyiEmail author
  • Wang Guangli
  • Gu Zhiguo
Original Paper
  • 50 Downloads

Abstract

Graphene quantum dots (GQDs) were prepared via pyrolysis of citric acid and glutamic acid, then reacted with chlorauric acid to form a gold/graphene quantum dot hybrid (Au/GQD), and finally connected with hairpin DNA probe 1 (H1) and thionine (Thi). The H1-Au/GQD-Thi composite is found to be a viable redox probe for electrochemical and aptamer-based determination of vascular endothelial growth factor VEGF165. A dual amplification strategy is employed based on the use of molecular machine and the Au/GQD. Each single VEGF165 molecule can bind two DNA probes via specific aptamer-target recognition to produce a molecular machine. Surface-tethered hairpin DNA 2 (H2) hybridizes with the molecular machine through proximity effect, and the prelocked toehold domain of H2 becomes exposed. This part binds to H1-Au/GQD-Thi to release the molecular machine which then moves to the neighboring H2 upon which a surface programmatic chain reaction is initiated. By continuous molecular machine travel, many H1-Au/GQD-Thi probes are present on the gold electrode surface. This implies an efficient signal amplification capability. The Au/GQD based redox probes in-situ catalyzes the redox activity of thionine and further enhances the detection signal. The aptasensor exhibits ultrahigh sensitivity and selectivity for VEGF165. The square wave voltammetric signal, best measured at −0.18 V vs. Ag/AgCl, increases linearly in the 1.0 fM to 120 pM VEGF165 concentration range, and the detection limit is 0.3 fM. Conceivably, the method may be applied to other target proteins if the corresponding high-affinity aptamers are available.

Graphical abstract

This study report one dual amplification strategy for ultrasensitive electrochemical detection of VEGF165 based on gold-graphene quantum dot hybrid (Au/GQD) and bipedal molecular machine (BMM) powered surface programmatic chain reaction (SPCR).

Keywords

Surface programmatic chain reaction Signal amplification Cancer diagnosis 

Notes

Acknowledgements

The authors acknowledge the financial support from The National Key Research and Development Program of China (No. 2018YFC1603001), National Natural Science Foundation of China (No. 21576115) and MOE & SAFEA for the 111 Project (B13025).

Compliance with ethical standards

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

Supplementary material

604_2019_3336_MOESM1_ESM.doc (439 kb)
ESM 1 (DOC 439 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.School of Chemical and Material EngineeringJiangnan UniversityWuxiChina
  2. 2.School of Pharmaceutical SciencesJiangnan UniversityWuxiChina

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