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Microchimica Acta

, Volume 184, Issue 2, pp 499–505 | Cite as

Electrochemical aptamer based assay for the neonicotinoid insecticide acetamiprid based on the use of an unmodified gold electrode

  • Seyed Mohammad Taghdisi
  • Noor Mohammad Danesh
  • Mohammad Ramezani
  • Khalil AbnousEmail author
Original Paper

Abstract

The authors report on an aptamer-based electrochemical assay for the insecticide acetamiprid. It is based on the target-induced release of the redox probe Methylene Blue (MB) from the dsDNA formed between aptamer and complementary strand (Apt/CS), exonuclease I (Exo I) and silica nanoparticles coated with streptavidin (SiNP-Streptavidin). MB is detected electrochemically using an unmodified gold electrode. In the presence of acetamiprid, MB is released from the Apt/CS dsDNA and accumulated in the close environment of the gold electrode. This results in a strong electrochemical signal for MB at fairly low working voltage of typically −0.27 V. In the absence of target, however, the SiNP-streptavidin conjugate modified MB-dsDNA remains intact. Hence, the electrochemical signal remains weak. The method displays high selectivity for acetamiprid and a limit of detection as low as 153 pM. The assay was successfully applied to the determination of acetamiprid in (spiked) water and serum samples, with LODs of 161 and 209 pM, respectively.

Graphical abstract

Schematic illustration of acetamiprid detection based on electrochemical assay. In the absence of acetamiprid, MB-dsDNA-modified SiNP-Streptavidin complex is intact and redox probe (MB) does not exist in the environment of electrode, resulting in a weak electrochemical signal (a). In the presence of target, Apt binds to acetamiprid and CS and MB leave the SiNP-Streptavidin. Exo I digests CS. So, a huge amount of MB is present in the environment of electrode and a strong electrochemical signal is observed (b).

Keywords

Methylene blue Differential pulse voltammetry Silica nanoparticles Insecticide Exonuclease I Complementary strand Water analysis Serum analysis 

Notes

Acknowledgements

Financial support of this study was provided by Mashhad University of Medical Sciences.

Compliance with ethical standards

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

Supplementary material

604_2016_2038_MOESM1_ESM.doc (153 kb)
ESM 1 (DOC 153 kb)

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Copyright information

© Springer-Verlag Wien 2016

Authors and Affiliations

  • Seyed Mohammad Taghdisi
    • 1
    • 2
  • Noor Mohammad Danesh
    • 3
    • 4
  • Mohammad Ramezani
    • 3
  • Khalil Abnous
    • 5
    • 6
    Email author
  1. 1.Targeted Drug Delivery Research CenterMashhad University of Medical SciencesMashhadIran
  2. 2.Department of Pharmaceutical Biotechnology, School of PharmacyMashhad University of Medical SciencesMashhadIran
  3. 3.Nanotechnology Research CenterMashhad University of Medical SciencesMashhadIran
  4. 4.Research Institute of Sciences and New TechnologyMashhadIran
  5. 5.Pharmaceutical Research CenterMashhad University of Medical SciencesMashhadIran
  6. 6.Department of Medicinal Chemistry, School of PharmacyMashhad University of Medical SciencesMashhadIran

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