Microchimica Acta

, 185:217 | Cite as

Voltammetric determination of the Escherichia coli DNA using a screen-printed carbon electrode modified with polyaniline and gold nanoparticles

  • Nahid Shoaie
  • Mehdi Forouzandeh
  • Kobra Omidfar
Original Paper


The authors describe an electrochemical assay for fast detection of Escherichia coli (E. coli). It is based on a dual signal amplification strategy and the use of a screen-printed carbon electrode (SPCE) whose surface was modified with a polyaniline (PANI) film and gold nanoparticles (AuNPs) via cyclic voltammetry (CV). In the next step, avidin was covalently immobilized on the PANI/AuNP composite on the SPCE surface. Subsequently, the biotinylated DNA capture probe was immobilized onto the PANI/AuNP/avidin-modified SPCE by biotin-avidin interaction. Then, DNA of E.coli, digoxigenin-labeled DNA detector probe and anti-digoxigenin-labeled horseradish peroxidase (HRP) were placed on the electrode. 3,3′,5,5′-Tetramethylbenzidine (TMB) and H2O2 solution were added and the CV electrochemical signal was generated at a potential of −0.1 V (vs. Ag/AgCl) and a scan rate 50 mV.s−1. The assay can detect 4 × 106 to 4 CFU of E. coli without DNA amplification. The biosensor is highly specific over other pathogens including Klebsiella pneumoniae, Proteus mirabilis, Enterococcus faecalis, Staphylococcus haemolyticus and Pseudomonas aeruginosa. It can be concluded that this genosensor has an excellent potential for rapid and accurate diagnosis of E.coli inflicted infections.

Graphical Abstract

Schematic of an electrochemical E. coli genosensor based on sandwich assay on a polyaniline/gold nanoparticle-modified screen printed carbon electrode (SPCE). The biosensor can detect 4 × 106 to 4 CFU of E. coli without DNA amplification.


Infectious diseases Cyclic voltammetry Screen-printed carbon electrode Capture probe Digoxigenin-labeled detector probe 



This research was supported by a grant from Tarbiat Modares University.

Compliance with ethical standards

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

Supplementary material

604_2018_2749_MOESM1_ESM.docx (1.6 mb)
ESM 1 (DOCX 1639 kb)


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Copyright information

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

Authors and Affiliations

  • Nahid Shoaie
    • 1
  • Mehdi Forouzandeh
    • 1
    • 2
  • Kobra Omidfar
    • 2
    • 3
  1. 1.Department of Medical Biotechnology, Faculty of Medical SciencesTarbiat Modares UniversityTehranIran
  2. 2.Biosensor Research CenterEndocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical ScienceTehranIran
  3. 3.Endocrinology and Metabolism Research CenterEndocrinology and Metabolism Research Institute, Tehran University of Medical SciencesTehranIran

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