Abstract
A ratiometric electrochemical immunosensor is proposed for simultaneous detection of cellular-myelocytomatosis oncoprotein (C-myc) and B-cell lymphoma 2 (Bcl-2) via the potential-resolved strategy. It relied on multi-role co-loaded alloy composites (CLACs) and poly(3,4-ethylenedioxythiophene) (PEDOT)-graphene oxide (GO)-multiwalled carbon nanotubes (MWCNTs) (PGM) modified electrodes. CLACs with good catalytic and enzyme-like properties were synthesized in one step by loading tetramethylbenzidine (TMB) or methylene blue (MB) into Pt-Pd alloy and used as label materials. After immunological reactions, CLACs showed distinguishable dual differential pulse voltammetry signals at − 0.26 V and 0.38 V, corresponding to C-myc and Bcl-2, and the PGM had an electrochemical signal at 1.2 V, which could be used as a reference signal to construct a ratiometric sensor. CLACs had a satisfactory synergistic effect with the PGM, and eventually achieved quadruple signal amplification. Thus, benefiting from multiple magnification and ratiometric self-calibration functions, sensitive detections of C-myc and Bcl-2 were achieved, with detection limits as low as 0.5 and 2.5 pg mL−1, respectively. Additionally, when the designed method was applied to blood samples from lymphoma patients, results consistent with the ELISA kit were obtained. This will open avenues for constructing multiple protein detection sensors.
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The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. Xiaoying Wang: conceptualization, methodology, software, writing—original draft. Wei Yuan: conceptualization, methodology, formal analysis, writing—review and editing. Yijing Kuang: methodology, software, visualization. Xuyuan Chen and Xiaoyu Zhang: validation, formal analysis, resources. Xiaoning Wang: validation, resources, funding acquisition. Xiaoying Wang: formal analysis, resources, funding acquisition, project administration. All authors read and approved the final manuscript.
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Wang, X., Yuan, W., Kuang, Y. et al. Ratiometric electrochemical immunosensor for simultaneous detection of C-myc and Bcl-2 based on multi-role alloy composites. Microchim Acta 191, 85 (2024). https://doi.org/10.1007/s00604-023-06161-8
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DOI: https://doi.org/10.1007/s00604-023-06161-8