Abstract
A novel electrochemical and fluorescence dual-signal assay was developed for the determination of hydrogen peroxide (H2O2) based on Fe3O4@MnO2 and N-doped carbon dots (NCDs). Fe3O4@MnO2 was not only applied as the recognizer for H2O2 but also served as the fluorescence quencher and electrochemical enhancer. This permits the dual-signal readout of the analytical system. In the absence of H2O2, the NCDs were quenched by Fe3O4@MnO2, and the oxidation of the electrochemical probe ferrocene (Fc) was catalyzed by Fe3O4@MnO2. In the presence of H2O2, MnO2 was reduced to Mn2+, leading to the fluorescence recovery of NCDs and the reduction in the oxidation signal of Fc. By combining the electrochemical method and the fluorescence assay, more comprehensive and valuable information for H2O2 determination was provided to meet different analytical demands. The method exhibits good repeatability and selectivity with a detection limit of 1.0 μM for the fluorescence assay and 0.6 μM for the electrochemical method. The proposed approach holds great potential for probing released targets from living cells.
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Funding
This study was supported by the National Natural Science Foundation of China (nos. 21904069, 81471301, and 81773681) and the Natural Science Foundation of Jiangsu Province (no. BK20190653). This work was also supported by the Natural Science Foundation for Higher School of Jiangsu Province (no. 19KJB350002) and the Foundation for Science and Technology Development of Nanjing Medical University (no. NMUB2018023).
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Zhu, W., Zhou, Y., Tao, M. et al. An electrochemical and fluorescence dual-signal assay based on Fe3O4@MnO2 and N-doped carbon dots for determination of hydrogen peroxide. Microchim Acta 187, 187 (2020). https://doi.org/10.1007/s00604-020-4163-5
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DOI: https://doi.org/10.1007/s00604-020-4163-5