Microchimica Acta

, 186:115 | Cite as

An electrochemical aptasensor for streptomycin based on covalent attachment of the aptamer onto a mesoporous silica thin film-coated gold electrode

  • Mahmoud RoushaniEmail author
  • Kazhal Ghanbari
Original Paper


An electrochemical method is described for the determination of streptomycin (STR). It is making use of a gold electrode coated with a thin mesoporous silica film (MSF). In addition, silver nanoparticles were coated on the MSF to increase the surface area, to bind a large amount of aptamer (Apt), and to improve the electrical conductivity. In the presence of STR, it will bind to the Apt and hinder the diffusion of the redox probe hexacyanoferrate through the nanochannels of the mesoporous film. The aptasensor, best operated at a working potential of 0.22 V (vs. Ag/AgCl) has a linear response in the 1 fg.mL−1 to 6.2 ng.mL−1 STR concentration range. The detection limit is 0.33 fg.mL−1. The assay was successfully validated by analyzing spiked samples of milk and blood serum.

Graphical abstract

Voltammetric assay of streptomycin (STR) by using a Fe(CN)63−/4- probe. The aptamer was immobilized on a gold electrode modified with a mesoporous silica thin film (MSF) that was functionalized with (3-aminopropyl) triethoxysilane (APTES) and silver nanoparticles (AgNP). Incubation with STR leads to a decrease of the current.


Silver nanoparticles Hexacyanoferrate Differential pulse voltammetry Tetraethoxysilane Cetyltrimethylammonium bromide 



The authors thank the Iran National Science Foundation (Grant no. 96015612) for their support.

Compliance with ethical standards

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

Supplementary material

604_2018_3191_MOESM1_ESM.doc (1.2 mb)
ESM 1 (DOC 1.20 MB)


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Copyright information

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

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of SciencesIlam UniversityIlamIran

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