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Development of a Competitive Lateral Flow Assay for Rapid Paraquat Detection

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Abstract

Paraquat dichloride is a widely used herbicide that poses a significant threat to human health. Its prohibition in several countries highlights the need for the development of a highly sensitive device capable of detecting minimum concentrations of this herbicide in food matrices. In this study, we developed a lateral flow test strip using gold nanoparticles conjugated to anti-paraquat antibodies for the visual and quantitative detection of paraquat in food samples. Through the optimization of various critical factors that affect the sensitivity of the test, we achieved visual and quantitative detection limits of 4 ppb and 1.69 ppb, respectively. These values fall below the maximum residue limits allowed for paraquat dichloride in the USA and the European Union. Results can be obtained in as little as 20 min and the test exhibited good repeatability, with a coefficient of variation of 3.27%. There was no cross reaction with the commonly used pesticides chlorpyrifos and glyphosate, indicating good selectivity. The viability of the test was further confirmed through the analysis of real samples such as soybean, potato, and banana, demonstrating its potential as a rapid and sensitive tool for detecting paraquat residues in food samples.

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All data generated or analyzed in this study are included in this article.

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Acknowledgements

This study used the equipment facilities of the Nanomedicine and Nanotoxicology Group and the Laboratory of Cellular Ultrastructure Carlos Alberto Redins. Our thanks to both Labs for providing the equipment and technical support for experiments.

Funding

This study had financial support from the Foundation for the Support of Research and Innovation of Espírito Santo (Grant No 10/2019).

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Contributions

Conceptualization: JPO; formal analysis and investigation: MDLJ and LACA; writing—original draft preparation: MDLJ, LACA, JPO; writing—review and editing: JPO, FVC, PWPA, and MCCG; and supervision: JPO.

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Correspondence to Jairo Pinto de Oliveira.

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Jara, M.D.L., Alvarez, L.A.C., Campos, F.V. et al. Development of a Competitive Lateral Flow Assay for Rapid Paraquat Detection. Food Anal. Methods 17, 284–295 (2024). https://doi.org/10.1007/s12161-023-02566-6

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  • DOI: https://doi.org/10.1007/s12161-023-02566-6

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