一氧化氮与超氧阴离子和过氧化氢自由基的反应：脉冲辐解研究
The reaction of NO. with O2.- and HO2.: a pulse radiolysis study.
作者信息
Goldstein S, Czapski G
机构信息
Department of Physical Chemistry, Hebrew University of Jerusalem, Israel.
出版信息
Free Radic Biol Med. 1995 Oct;19(4):505-10. doi: 10.1016/0891-5849(95)00034-u.
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) x 10(9) M-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) x 10(9) M-1s-1 at pH 3.3.
在pH值为3.3 - 10.0的伪一级条件下，使用脉冲辐解技术研究了NO·与O₂⁻以及与HO₂·的反应，其中([O₂⁻]₀ + [HO₂·]₀) > [NO·]₀。通过监测250 nm处O₂⁻的衰减和302 nm处ONOO⁻的形成来确定NO·与O₂⁻反应的速率常数，结果为(4.3 ± 0.5)×10⁹ M⁻¹s⁻¹，在6.1 - 10.0范围内与离子强度和pH无关。通过跟踪250 nm处HO₂·的衰减来确定NO·与HO₂·反应的速率常数，在pH 3.3时为(3.2 ± 0.3)×10⁹ M⁻¹s⁻¹。
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