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Microchimica Acta

, 185:448 | Cite as

Colorimetric aptasensor for Campylobacter jejuni cells by exploiting the peroxidase like activity of Au@Pd nanoparticles

  • Zahra Dehghani
  • Morteza HosseiniEmail author
  • Javad Mohammadnejad
  • Bita Bakhshi
  • Ali Hossein Rezayan
Original Paper

Abstract

The authors describe a method for colorimetric determination of Campylobacter jejuni (C. jejuni) in milk samples. It is based on the interaction of a specific DNA aptamer with surface protein in the cell membranes of C. jejuni. Specific binding of the aptamer with the cell membrane leads to an uptake of aptamer from solution. As a result, the concentration of aptamer floating in the solution is reduced. In the presence of large quantities of aptamer, the surface of added Au@Pd nanoparticles (NPs) is covered with aptamer via electrostatic interactions. Hence, they cannot act as a peroxidase mimic and oxidize the substrate 3,3,5,5-tetramethylbenzidine (TMB) to give a blue product. However, when the aptamer is bound by the target cells, the surface of the NPs is not blocked by aptamer and the NPs exert a strong peroxidase -like activity. Under defined experimental conditions, the intensity of the blue color increases with the concentration of C. jejuni, and as little as 100 CFU·mL−1 can bedetected in milk.

Graphical abstract

A colorimetric aptasensor for assay Campylobacter jejuni whole cell in food samples was investigated. This assay was designed based on interaction of specific DNA aptamer with surface protein in c. jejuni cell membrane without any modification of aptamer.

Keywords

Colorimetry DNA aptamer Enzyme mimic Bacteria Milk 

Notes

Acknowledgements

The authors thank the research Council of University of Tehran (Grant 28645/01/02) and Tehran University of Medical Sciences for financial support of this work.

Compliance with ethical standards

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

Supplementary material

604_2018_2976_MOESM1_ESM.docx (368 kb)
ESM 1 (DOCX 368 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.Department of Life Science Engineering, Faculty of New Sciences & TechnologiesUniversity of TehranTehranIran
  2. 2.Department of Pharmaceutical Biomaterials and Medical Biomaterials Research Center, Faculty of PharmacyTehran University of Medical SciencesTehranIran
  3. 3.School of Medical SciencesUniversity of Tarbiat ModaresTehranIran

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