Chemical trapping and characterization of small oxoacids of sulfur (SOS) generated in aqueous oxidations of H2 S

Redox Biology
Murugaeson R Kumar, Patrick J Farmer

Abstract

Small oxoacids of sulfur (SOS) are elusive molecules like sulfenic acid, HSOH, and sulfinic acid, HS(O)OH, generated during the oxidation of hydrogen sulfide, H2S, in aqueous solution. Unlike their alkyl homologs, there is a little data on their generation and speciation during H2S oxidation. These SOS may exhibit both nucleophilic and electrophilic reactivity, which we attribute to interconversion between S(II) and S(IV) tautomers. We find that SOS may be trapped in situ by derivatization with nucleophilic and electrophilic trapping agents and then characterized by high resolution LC MS. In this report, we compare SOS formation from H2S oxidation by a variety of biologically relevant oxidants. These SOS appear relatively long lived in aqueous solution, and thus may be involved in the observed physiological effects of H2S.

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Citations

Mar 7, 2020·Arteriosclerosis, Thrombosis, and Vascular Biology·Gopi K KolluruChristopher G Kevil
Jun 27, 2020·Antioxidants & Redox Signaling·Kenneth R Olson
Aug 29, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Murugaeson R Kumar, Patrick J Farmer
Aug 2, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sergei V MakarovAnna S Makarova

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