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Microchimica Acta

, 185:408 | Cite as

An organic electrochemical transistor for determination of microRNA21 using gold nanoparticles and a capture DNA probe

  • Jing Peng
  • Tao He
  • Yulian Sun
  • Yawen Liu
  • Qianqian Cao
  • Qiong Wang
  • Hao Tang
Original Paper

Abstract

A method is described for the determination of microRNA. It is based on the use of organic electrochemical transistors (OECTs) fabricated on a flexible poly(ethylene terephthalate) substrate. A gold electrode was modified with gold nanoparticles to immobilize the capture DNA probe and then served as the gate of the device. The detection of microRNA21 was realized by monitoring the change of the drain-source current after hybridization of capture DNA with microRNA21. Under optimal conditions, this biosensor exhibits good sensitivity and specificity. It works in the 5 pM to 20 nM microRNA concentration range and has a 2 pM detection limit.

Graphical abstract

Schematic of the organic electrochemical transistor-based microRNA21 biosensor. It constitutes a screen-printed carbon source (S) and drain (D) electrodes, a spin-coated poly(3,4-ethylenedioxythiophere):poly(styrene sulfonic acid) (PEDOT:PSS) film on the poly(ethylene terephthalate) (PET) substrate, and a gold gate modified with gold nanoparticles (Au NPs), capture probe, and 6-mercapto-1-hexanol (MCH).

Keywords

Organic bioelectronics Screen-printing Flexible device Nanomaterial surface modification Self-assembling Electrochemical biosensor HeLa cells 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China under grants (21275050 and 21145001), the Hunan Provincial Natural Science Foundation of China (13JJ1016), the Scientific Research Fund of Hunan Provincial Education Department (13A053), the Construct Program of the Key Discipline in Hunan Province, and Foundation of the Science & Technology Department of Hunan Province (2016SK2020).

Compliance with ethical standards

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

Supplementary material

604_2018_2944_MOESM1_ESM.docx (4 mb)
ESM 1 (DOCX 4064 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical EngineeringHunan Normal UniversityChangshaPeople’s Republic of China
  2. 2.College of ScienceCentral South University of Forestry and TechnologyChangshaPeople’s Republic of China

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