KINETICS AND MECHANISM FOR THE OXIDATION OF ASCORBIC-ACID ASCORBATE BY HO2 O2- RADICALS - A PULSE-RADIOLYSIS AND STOPPED-FLOW PHOTOLIS STUDY
KINETICS AND MECHANISM FOR THE OXIDATION OF ASCORBIC-ACID ASCORBATE BY HO2 O2- RADICALS - A PULSE-RADIOLYSIS AND STOPPED-FLOW PHOTOLIS STUDY
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DOI：
10.1021/j100233a031
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发表时间：
1983-01-01
影响因子：
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通讯作者：
BIELSKI, BHJ
中科院分区：
文献类型：
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作者：
CABELLI, DE;BIELSKI, BHJ
AH2/AH”与H02/02”反应的速率常数为：H02与AH2反应的速率常数为ks= 1.6 X 101 234 M“1 s”1，AH2与H02、AH2与02”反应的速率常数为kxl+ 0.365 fclg= 1.22 X 107 M“1 s”1，AH2与02”反应的速率常数为kxg= 5 X 104 M“1 s”1。测定了A ‘ ’·与H02和02 ‘ ’的自由基-自由基反应，发现分别以k9= 5 X 109 s ' 1和kxl= 2.6 X 10 M ' 1 s ' 1的速率进行。提出了与实验结果一致的“h2o2 /02”氧化AH2/AH的总体机理。
The reaction between AH2/AH" and H02/02" was followed frompH 0.3 to 11, leading to the following rate constants: ks= 1.6 X 101 234 M" 1 6s" 1 for the reaction between AH2 and H02, kxl+ 0.365 fclg= 1.22 X 107 8M" 1 s'1 for the reactions between AH" and H02 and AH2 and 02", respectively, and kxg= 5 X 104 M" 1 s" 1 for the reaction between AH" and 02". The radical-radical reactions of A"· with H02 and 02" were measured and found to proceed at rates of k9= 5 X 109 s" 1 and kxl= 2.6 X 10® M" 1 s" 1, respectively. An overall mechanism for the oxidation of AH2/AH" by H02/02" consistent with the experimental results is also proposed.