Abstract
A surface plasmon resonance (SPR) biosensor for the pesticide carbendazim is described that has enhanced performance due to the use of a Au/Fe3O4 nanocomposite as an amplifying label on the surface the carboxymethyldextran-coated gold layer of the sensor. The surface was further modified with monoclonal antibody to obtain a sensor for real-time detection of carbendazim. Binding of carbendazim results in a change in refractive index. SPR detection in the absence of Au/Fe3O4 nanocomposite and by UPLC-MS analysis demonstrated the improved performance to be due to the use of the Au/Fe3O4 nanocomposite. Response is linear in the 0.05 to 150 ng·mL−1 carbendazim concentration range, and the limit of detection is 0.44 ng·mL−1. This is more than 1 order of magnitude lower than that of the conventional SPR assay. The recoveries from spiked medlar are between 102.4 and 115.0%. The selectivity was tested by using the pesticides benzimidazole, 2-mercaptobenzimidazole, 2-benzimidazole propionic acid, and 2-(2-aminoethyl) benzimidazole as potential interferents. Conceivably, this Au/Fe3O4 nanocomposite-based method has a large potential for the detection of other small analytes at trace concentrations.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 81703699, 81573595, and 81603398), CAMS Innovation Fund for Medical Sciences (No. 2016-I2M-1-012 and 2017-I2M-1-013), the Graduate Student Innovation Fund of Peking Union Medical College (No. 2017-1007-14), and National Science and Technology Major Project for ‘Significant New Drugs Development’ (2018ZX09721004-010). The authors acknowledge Beijing Inter-bio Tech CO., LTD for providing the surface plasmon resonance device.
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Li, Q., Dou, X., Zhao, X. et al. A gold/Fe3O4 nanocomposite for use in a surface plasmon resonance immunosensor for carbendazim. Microchim Acta 186, 313 (2019). https://doi.org/10.1007/s00604-019-3402-0
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DOI: https://doi.org/10.1007/s00604-019-3402-0