Free radical yields from the homolysis of peroxynitrous acid. |
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| Authors: | G Yang T E Candy M Boaro H E Wilkin P Jones N B Nazhat R A Saadalla-Nazhat D R Blake |
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| Institution: | Department of Chemistry, University of Newcastle upon Tyne, U.K. |
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| Abstract: | A recent study reports discordant results for maximal free-radical yields from the decomposition of peroxynitrous acid using different assay reagents and a puzzling decrease (to zero) of the radical yields with increasing pH. An assay method using 2,2,'azino-bis(3-ethyl-benzthiazoline sulphonate) (ABTS) has been tested using stopped-flow kinetic studies, and the results imply that the assay is satisfactory when HOONO] much greater than -OONO] but that reactions involving peroxynitrite anion interfere at higher pH. Evidence is presented that peroxynitrite was an interfering species in the earlier studies. |
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