Abstract
A zinc-modified octa(aminopropyl)silsesquioxane and the cyan compound Na2[Fe(CN)5NO] were prepared to create a hybrid electroactive material (ACZnN) characterized employing the spectroscopic techniques Raman spectroscopy, Diffuse Reflectance (DR), X-Ray diffraction (XRD), Scanning Electronic Microscopy (SEM), thermogravimetric analysis (TGA) and voltammetric measurements. The cyclic voltammetry technique indicated the solid ACZnN on the electrode surface as presenting two redox processes, with EIθ' = 0.21 V and EIIθ' = 0.51 V (vs Ag/AgCl(sat)) attributed to the redox pair Fe2+(CN)5NO/ Fe3+(CN)5NO in the absence and presence of Zn2+, respectively, as well as adequate stability, reliability and efficiency for practical applications. The ACZnN-modified graphite paste electrode exhibited a sensitive and catalytic oxidation response towards N-acetylcysteine and was successfully employed 1in the catalytic electro-oxidation of N-acetylcysteine employing differential pulse voltammetry techniques. The lowest limit of detection and best amperometric sensitivity obtained by differential pulse voltammetry were 0.657 µmol L−1 and 500 mA/mol L−1, respectively, from 1.0 × 10–6 to 1.0 × 10–5 M. Further analyses applying this method also demonstrated the compound’s efficiency in detecting N-acetylcysteine in synthetic urine samples.
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Acknowledgements
Mariana de Souza Magossi would like to express her gratitude to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the granted scholarship granted/ and The authors would like to acknowledge the Instituto Federal Goiano and the CNPq for the financial support
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This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP – Process 2018/24576–2).
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Mariana de Souza Magossi: designed and performed the electrochemical experiments and verified the analytical methods; Murilo Santos Peixoto, Abner Santos Baroni Sales, Alexsandro dos Santos Felipe and Newton Luiz Dias Filho: performed several spectroscopic and analytical experiments. Devaney Ribeiro do Carmo: conceived of the idea, performed several spectroscopic experiments, and wrote the manuscript in consultation with the other authors. All authors participated in the discussion, contributing to the final manuscript.
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do Carmo, D.R., Peixoto, M.S., dos Santos Felipe, A. et al. Synthesis of a New Zn2+/Fe3+ Octa(aminopropyl)silsesquioxane Complex and Its Voltammetric Behavior Towards N-acetylcysteine. Silicon 15, 683–697 (2023). https://doi.org/10.1007/s12633-022-02030-w
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DOI: https://doi.org/10.1007/s12633-022-02030-w