Abstract
A glassy carbon electrode was modified with a redox-active nanocomposite consisting of polyresorcinol, gold nanoparticles (NPs) and platinum NPs. This nanocomposite possesses the following outstanding advantages: (1) strong electrochemical signal towards H2O2 at 0.92 V (vs Ag/AgCl); (2) good conductivity; and (3) ease of immobilization of antibody without the use of coupling agents. Based on these properties, a label-free amperometric immunoassay for the tumor marker neuron-specific enolase (NSE) was developed. The immunoelectrode has a linear response in the 10 pg·mL−1 to 100 ng·mL−1 NSE concentration range and a 7.8 pg·mL−1 detection limit (at an SNR of 3). The method was applied to the quantitation of NSE in human serum samples and showed satisfactory accuracy compared to an electrochemiluminescence immunoassay, a commonly used method in clinical applications.
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Acknowledgements
This research was financed by grants from the National Natural Science Foundation of China (21273153, 21673143), Natural Science Foundation of Beijing Municipality (2172016, 2132008), and the Project of the Construction of Scientific Research Base by the Beijing Municipal Education Commission.
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Wang, H., Ma, Z. Amperometric immunoassay for the tumor marker neuron-specific enolase using a glassy carbon electrode modified with a nanocomposite consisting of polyresorcinol and of gold and platinum nanoparticles. Microchim Acta 184, 3247–3253 (2017). https://doi.org/10.1007/s00604-017-2287-z
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DOI: https://doi.org/10.1007/s00604-017-2287-z