Abstract
The family of zearalenones (ZENs) represents a major group of mycotoxins with estrogenic activity. They are produced by Fusarium fungi and cause adverse effects on human health and animal production. The authors describe here a label-free amperometric immunosensor for the direct determination of ZENs. A glassy carbon electrode (GCE) was first modified with polyethyleneimine-functionalized multi-walled carbon nanotubes. Next, gold and platinum nanoparticles (AuPt-NPs) were electro-deposited. This process strongly increased the surface area for capturing a large amount of antibodies and enhanced the electrochemical performance. In a final step, monoclonal antibody against zearalenone was orientedly immobilized on the electrode, this followed by surface blocking with BSA. The resulting biosensor was applied to the voltammetry determination of ZENs, best at a working voltage of 0.18 V (vs SCE). Under optimized conditions, the method displays a wide linear range that extends from 0.005 to 50 ng mL−1, with a limit of detection of 1.5 pg mL−1 (at an S/N ratio of 3). The assay is highly reproducible and selective, and therefore provides a sensitive and convenient tool for determination of such mycotoxins.
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Acknowledgments
This work was supported by the “973” program (2013CB127801), Shanghai Municipal Commission for Science and Technology (15230724400 and 14391901800), and the Public Science and Technology Research Funds of State Grains Bureau (201313005-01-2 and 201513006-02).
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Liu, N., Nie, D., Tan, Y. et al. An ultrasensitive amperometric immunosensor for zearalenones based on oriented antibody immobilization on a glassy carbon electrode modified with MWCNTs and AuPt nanoparticles. Microchim Acta 184, 147–153 (2017). https://doi.org/10.1007/s00604-016-1996-z
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DOI: https://doi.org/10.1007/s00604-016-1996-z