Abstract
Nitrogen dioxide, formed by γ-radiolysis in deaerated aqueous nitrate/nitrite solutions, is capable of oxidizing Gly-Tyr in favourable competition with the natural decay of NO2• by dimerization and disproportionation. 2,2′-Biphenolic tyrosine dimers and nitro-tyrosine were identified spectroscopically as stable products. The results suggest that NO2• reacts with the peptide by electron abstraction, generating Gly-Tr phenoxyl radicals (PheO•) which terminate by dimerization (2 PheO• → 2,2′-biphenol) and NO2• -scavenging (PheO• + NO2• → Nitro-Tyr).
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