Abstract
A label-free nanoimmunosensor is reported based on p53/CeO2/PEDOT nanobiocomposite-decorated screen-printed gold electrodes (SPAuE) for the electrochemical detection of anti-p53 autoantibodies. CeO2 nanoparticles (NPs) were synthesized and stabilized with cyanopropyltriethoxysilane by a soft chemistry method. The nanoimmunosensing architecture was prepared by in situ electropolymerization of 3,4-ethylenedioxythiophene (EDOT) on SPAuE in the presence of CeO2 NPs. The CeO2 NPs and Ce/PEDOT/SPAuE were characterized by scanning and transmission electron microscopy, dynamic and electrophoretic light scattering, ultraviolet–visible spectrophotometry, X-ray diffraction, Fourier-transform infrared spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. Ce/PEDOT/SPAuE was biofunctionalized with p53 antigen by covalent bonding for the label-free determination of anti-p53 autoantibodies by differential pulse voltammetry. The nanobiocomposite-based nanoimmunosensor detected anti-p53 autoantibodies in a linear range from 10 to 1000 pg mL−1, with a limit of detection (LOD) of 3.2 pg mL−1. The nanoimmunosensor offered high specificity, selectivity, and long-term storage stability with great potential to detect anti-p53 autoantibodies in serum samples. Overall, incorporating organo-functional nanoparticles into polymeric matrices can provide a simple-to-assemble, rapid, and ultrasensitive approach for on-site screening of anti-p53 autoantibodies and other disease-related biomarkers with low sample volumes.
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Acknowledgements
We thank The Ruta N complex and EPM for hosting the Max Planck Tandem Groups.
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The work has been funded by MINCIENCIAS, MINEDUCACIÓN, MINCIT, and ICETEX through the Program Ecosistema Científico Cod. FP44842-211–2018, project number 58536. J. O. received support from The University of Antioquia and the Max Planck Society through the cooperation agreement 566–1, 2014.
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Andrés F. Cruz-Pacheco: conceptualization; methodology; formal analysis; investigation; data curation; writing—original draft. Jennifer Quinchia: investigation; data curation; writing—original draft. Jahir Orozco: conceptualization; formal analysis; writing—review and editing; supervision; project administration; funding acquisition.
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Cruz-Pacheco, A.F., Quinchia, J. & Orozco, J. Cerium oxide–doped PEDOT nanocomposite for label-free electrochemical immunosensing of anti-p53 autoantibodies. Microchim Acta 189, 228 (2022). https://doi.org/10.1007/s00604-022-05322-5
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DOI: https://doi.org/10.1007/s00604-022-05322-5