Kinetics and mechanism of pyrogallol autoxidation

被引:0
作者
Yuan, ZB
Gao, RM
机构
来源
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE | 1997年 / 18卷 / 09期
关键词
pyrogallol autooxidation; single-sweep oscillopolarography; computer simulation; kinetics;
D O I
暂无
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The kinetics of pyrogallol autooxidation has been studied by single-sweep oscillopolarography in Tris-HCl buffer soluton in the pH range 7.20 similar to 9.10. The reaction was first order to pyrogallol in the presence of excess dissolved O-2, The focus was put on pyrogallol autooxidation with products of semiquinone free radical and active oxygen. A mechanism was presented which explains the increase in rate with increasing pH by postulating that H2PYR- has a greater reactivity with dissolved O-2 than H3PYR. The derived rate law is in good agreement with the experimental observations, The paper also presented a new assay for superoxide dismutase and antioxidant activity of pharmaceuticals.
引用
收藏
页码:1438 / 1441
页数:4
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