Interactions of thiyl free radicals with oxygen: a pulse radiolysis study.
Interactions of thiyl free radicals with oxygen: a pulse radiolysis study.
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硫基自由基与氧的相互作用：脉冲放射分解研究。
DOI：
10.1080/09553008614550991
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
M. Quintiliani
中科院分区：
文献类型：
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作者：
M. Tamba;G. Simone;M. Quintiliani
在含有不同比例的N₂O/O₂混合物且pH为5.5的水溶液中对谷胱甘肽进行的脉冲辐解研究表明，氧迅速与谷胱甘肽硫自由基加成，产生一种在540nm处有最大吸收的瞬态吸收，其特征似乎与GSOO·自由基的归属相符。反应（公式：见正文）似乎是一个平衡，其动力学常数已被估算（kf = 2.0×10⁹dm³mol⁻¹，kb = 6.2×10⁵s⁻¹）。已经获得了从抗坏血酸到GSOO·自由基的电子转移的证据，并且相应的速率常数已被确定为1.75±0.15×10⁸dm³mol⁻¹s⁻¹。
A pulse radiolysis study of glutathione in aqueous solution at pH 5.5 containing N2O/O2 mixtures at various ratios indicates that oxygen rapidly adds to the thiyl glutathione radical yielding a transient absorption, with a maximum at 540 nm, whose characteristics appear to be compatible with assignment to the GSOO. radical. The reaction (Formula: see text) appears to be an equilibrium whose kinetic constants have been estimated (kf = 2.0 X 10(9) dm3 mol-1, kb = 6.2 X 10(5) s-1). Evidence for electron transfer from ascorbate to the GSOO. radical has been obtained and the respective rate constant has been determined to be 1.75 +/- 0.15 X 10(8) dm3 mol-1 s-1.