The reaction of NO· with O2·- and HO2·-: A pulse radiolysis study

Sara Goldstein*, Gidon Czapski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

394 Scopus citations

Abstract

The reactions of NO·- with O2·- and with HO2·- were studied using the pulse radiolysis technique under pseudo first order conditions where ([O2·-]o + [HO2·-]o) > [NO·]o at pH 3.3-10.0. The rate constant of the reaction of NO' with O2· was determined both by monitoring the decay of O2·- at 250 nm and the formation of ONOO at 302 nm to be (4.3 ± 0.5) × 109M-1s-1, independent of ionic strength and pH in the range of 6.1-10.0. The rate constant of the reaction of NO· with HO2·- was determined by following the decay of HO2· at 250 nm to be (3.2 ± 0.3) × 109 M-1s-1 at pH 3.3.

Original languageEnglish
Pages (from-to)505-510
Number of pages6
JournalFree Radical Biology and Medicine
Volume19
Issue number4
DOIs
StatePublished - Oct 1995

Keywords

  • Free radicals
  • Nitric oxide
  • Peroxynitrite
  • Pulse radiolysis
  • Superoxide

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