The reaction of sulfenic acids with OH and HO2 radicals in different environments
Sulfenic acids are involved in major chemical processes occurring in the atmosphere, in food chemistry and in biological systems. In these diverse environments, oxidation reactions caused by reactive oxygen species, especially hydroxyl (OH) and hydroperoxyl (HO2) radicals, are very important, but th...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/387359 |
| Acceso en línea: | http://hdl.handle.net/10261/387359 https://api.elsevier.com/content/abstract/scopus_id/105002400406 |
| Access Level: | acceso abierto |
| Palabra clave: | Sulfenic acids http://metadata.un.org/sdg/3 Ensure healthy lives and promote well-being for all at all ages |
| Sumario: | Sulfenic acids are involved in major chemical processes occurring in the atmosphere, in food chemistry and in biological systems. In these diverse environments, oxidation reactions caused by reactive oxygen species, especially hydroxyl (OH) and hydroperoxyl (HO2) radicals, are very important, but their mechanisms remain poorly understood. To address this question, in this paper we present high-level theoretical results on selected reactions in gas phase and in aqueous solution. The study shows that the abstraction of the acidic hydrogen by OH or HO2 is the most important process in all cases. It leads to the formation of sulfinyl radicals and H2O or H2O2, respectively, following a proton-coupled electron transfer (pcet) mechanism. The associated rate constants depend on sulfenic acid derivative when the oxidizing species is HO2, but all processes are diffusion controlled in the case of reaction with OH. From structurally simple systems to a cysteine-derived model peptide, this work provides a systematic study that contributes to a comprehensive understanding of the reactivity of sulfenic acids with radicals. |
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