Abstract
We developed a sensing strategy that mimics the bead-based electrogenerated chemiluminescence immunoassay. However, instead of the most common metal complexes, such as Ru or Ir, the luminophore is luminol. The electrogenerated chemiluminescence of luminol was promoted by in situ electrochemical generation of hydrogen peroxide at a boron-doped diamond electrode. The electrochemical production of hydrogen peroxide was achieved in a carbonate solution by an oxidation reaction, while at the same time, microbeads labelled with luminol were deposited on the electrode surface. For the first time, we proved that was possible to obtain light emission from luminol without its direct oxidation at the electrode. This new emission mechanism is obtained at higher potentials than the usual luminol electrogenerated chemiluminescence at 0.3–0.5 V, in conjunction with hydrogen peroxide production on boron-doped diamond at around 2–2.5 V (vs Ag/AgCl).
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Experimental data are available in AMS acta at https://amsacta.unibo.it/id/eprint/7694.
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Acknowledgements
AF acknowledges the Japan Society for the Promotion of Science (Fellowship ID No. P19333).
Funding
AF acknowledges the Japan Society for the Promotion of Science for funding this work with Grant-in-Aid for JSPS Fellows, Grant Number 19F19333. GV and FP would like to thank the MIUR, grant numbers 20225P4EJC, P2022E5YSK, and 2020CBEYHC (AStraLI). This work was supported by Nano-ImmunoEra project that has received funding from the European Union’s MSCA Staff exchange Horizon Europe programme, grant agreement number 101086341.
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Conceptualization: Andrea Fiorani. Methodology: Andrea Fiorani, Claudio Ignazio Santo, Kohei Sakanoue. Formal analysis and investigation: Andrea Fiorani, Claudio Ignazio Santo. Writing—original draft preparation: Andrea Fiorani. Writing—review and editing: Andrea Fiorani, Claudio Ignazio Santo, Valenti Giovanni. Funding acquisition: Andrea Fiorani, Yasuaki Einaga. Resources: Andrea Fiorani, Donato Calabria, Mara Mirasoli, Francesco Paolucci, Giovanni Valenti, Yasuaki Einaga. Supervision: Andrea Fiorani.
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Published in the topical collection Optical Biosensors and Biomimetic Sensors for Chemical Analysis with guest editors Elena Benito-Peña and Guillermo Orellana.
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Fiorani, A., Santo, C.I., Sakanoue, K. et al. Electrogenerated chemiluminescence from luminol-labelled microbeads triggered by in situ generation of hydrogen peroxide. Anal Bioanal Chem (2024). https://doi.org/10.1007/s00216-024-05356-z
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DOI: https://doi.org/10.1007/s00216-024-05356-z