REACTIONS OF OXYGEN RADICAL SPECIES WITH METHIONAL - PULSE-RADIOLYSIS STUDY
REACTIONS OF OXYGEN RADICAL SPECIES WITH METHIONAL - PULSE-RADIOLYSIS STUDY
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DOI：
10.1016/0006-291x(76)91111-6
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发表时间：
1976-01-01
影响因子：
3.1
通讯作者：
MICHEL, C
中科院分区：
文献类型：
--
作者：
BORS, W;LENGFELDER, E;MICHEL, C
羟基自由基（.OH）和超氧阴离子（O2-）与蛋氨酸[β-甲基-巯基-丙醛]的脉冲辐射分解方法进行了研究。OH攻击的二级速率常数测定为8.2 × 10 - 4。109 M-1 S-1在O2-的情况下，缓慢的一级衰减速率为5.2 × 10 - 4。103 s-1表明反应效率低得多。通过与模型化合物的脉冲辐解和EPR谱的结果进行比较，确定了瞬态物种。OH氧化甲硫醛的机理比简单的裂解反应更为复杂。
The reaction of hydroxyl radicals (.OH) and superoxide anions (O2-) with methional [.beta.-methyl-mercapto-propanal] were investigated by pulse-radiolytic methods. The second-order rate constant for the attack of OH was determined at 8.2 .times. 109 M-1 s-1. In the case of O2- a slow first-order decay rate of 5.2 .times. 103 s-1 suggests a far less efficient reaction. The transient species were identified by comparison with published results of pulse radiolysis and EPR spectroscopy of model compounds. The mechanism for the oxidation of methional by .OH was found to be more complex than a simple fragmentation reaction.