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Impedimetric aptasensor for Pseudomonas aeruginosa by using a glassy carbon electrode modified with silver nanoparticles

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Abstract

An aptasensor is described for the ultrasensitive detection of Pseudomonas aeruginosa (P. aeruginosa). A glassy carbon electrode (GCE) was first modified by electrodeposition of silver nanoparticles (AgNPs). Immobilization of NH2-aptamer was covalently attached to the AgNP/GCE surface. The morphology, distribution and size of the sensor were characterized by field emission scanning electron microscopy. Cyclic voltammetry and electrical impedance spectroscopy were used to study conductivity of the aptasensor and the electrochemical properties. Detection of P. aeruginosa was carried out by evaluation of the charge transfer resistance after and before the adding of P.aeruginosa and by using the hexacyanoferrate redox system as an electrochemical probe. The impedance increases on going from 102 to 107 CFU·mL−1 concentrations of P. aeruginosa, and the detection limit is 33 CFU·mL−1 (for S/N = 3). The assay was successfully applied for the determination of P. aeruginosa in spiker serum samples.

Schematic representation of an impedimetric assay for Pseudomonas aeruginosa by using a [Fe(CN)6]3−/4- probe based on immobilization of amino-modified aptamer onto a glassy carbon electrode (GCE) modified with silver nanoparticles (AgNPs): Incubation with P. aeruginosa leads to an increase of the charge-transfer resistance.

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Acknowledgements

This study has been supported by the Ilam University.

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Authors and Affiliations

  1. Department of Chemistry, Ilam University, PO. Box 69315-516, Ilam, Iran

    Mahmoud Roushani & Masoumeh Sarabaegi

  2. Department of Veterinary, Faculty of microbiology, University of Ilam, PO. Box 69315-516, Ilam, Iran

    Fazal Pourahmad

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  1. Mahmoud Roushani
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  2. Masoumeh Sarabaegi
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  3. Fazal Pourahmad
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Correspondence to Mahmoud Roushani.

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Roushani, M., Sarabaegi, M. & Pourahmad, F. Impedimetric aptasensor for Pseudomonas aeruginosa by using a glassy carbon electrode modified with silver nanoparticles. Microchim Acta 186, 725 (2019). https://doi.org/10.1007/s00604-019-3858-y

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  • DOI: https://doi.org/10.1007/s00604-019-3858-y

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