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A sandwich electrochemical immunosensor for Salmonella pullorum and Salmonella gallinarum based on a screen-printed carbon electrode modified with an ionic liquid and electrodeposited gold nanoparticles

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Abstract

This article describes an electrochemical immunosensor for rapid determination of Salmonella pullorum and Salmonella gallinarum. The first step in the preparation of the immunosensor involves the electrodeposition of gold nanoparticles used for capturing antibody and enhancing signals. In order to generate a benign microenvironment for the antibody, the ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate was used to modify the surface of a screen-printed carbon electrode (SPCE). The single steps of modification were monitored via cyclic voltammetry and electrochemical impedance spectroscopy. Based on these findings, a sandwich immunoassay was worked out for the two Salmonella species by immobilizing the respective unlabeled antibodies on the SPCE. Following exposure to the analytes, secondary antibody (labeled with HRP) is added to form the sandwich. After adding hydrogen peroxide and thionine, the latter is oxidized and its signal measured via CV. A linear response to the Salmonella species is obtained in the 104 to 109 cfu · mL−1 concentration range, and the detection limits are 3.0 × 103 cfu · mL−1 for both species (at an SNR of 3). This assay is sensitive, highly specific, acceptably accurate and reproducible. Given its low detection limit, it represents a promising tool for the detection of S. pullorum, S. gallinarum, and - conceivably - of other food-borne pathogens by exchanging the antibody.

We describe an electrochemical sandwich assay based on a screen-printed carbon electrode, gold nanoparticles and ILs and capable of detecting Salmonella pullorum and Salmonella gallinarum. The preparation is outlined in the Schematic.

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Acknowledgments

This project was supported by the Food Science and Engineering the most important discipline of Zhejiang province (JYTSP20141062). The Talent training provincial superior paper funded project (1110JY1412001P). Postgraduate Scientific and Technological Innovation Project of Zhejiang Gongshang University (3100XJ1514146) and Plans for college students in Zhejiang Province science and technology innovation activities (acrobatic tender grass talent programme) project (1110JQ4212048G). Project supported by the fund of the National Natural Science Fund (30571623). Analysis and testing projects of Zhejiang public innovation platform (2015C37023).

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Authors and Affiliations

  1. Food Safety Key Lab of Zhejiang Province, College of Food Science and Biotechnology Engineering, Zhejiang Gongshang University, Hangzhou, 310018, People’s Republic of China

    Jianfeng Fei, Wenchao Dou & Guangying Zhao

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  1. Jianfeng Fei
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  2. Wenchao Dou
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  3. Guangying Zhao
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Correspondence to Wenchao Dou or Guangying Zhao.

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Fei, J., Dou, W. & Zhao, G. A sandwich electrochemical immunosensor for Salmonella pullorum and Salmonella gallinarum based on a screen-printed carbon electrode modified with an ionic liquid and electrodeposited gold nanoparticles. Microchim Acta 182, 2267–2275 (2015). https://doi.org/10.1007/s00604-015-1573-x

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  • DOI: https://doi.org/10.1007/s00604-015-1573-x

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