Investigations on the reduction of molecular oxygen on polyphenol oxidase-modified electrode

被引：1
|
作者：
Jiang, H [1 ]
Shi, CH [1 ]
Xie, YS [1 ]
Liu, QL [1 ]
机构：
[1] Univ Sci & Technol China, Dept Chem, Hefei 230026, Peoples R China
来源：
COLLECTION OF CZECHOSLOVAK CHEMICAL COMMUNICATIONS | 2005年 / 70卷 / 03期
关键词：
square-wave voltammetry; polyphenol oxidase; oxygen detection; Nafion modified electrode; enzymes; modified electrodes; electrochemistry;
D O I：
10.1135/cccc20050305
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Polyphenol oxidase (PPO, E.C.1.10.3.1) from Nicotiana tobacum, PPO II, shows a different behavior from that of PPOs from other sources. A one-electron oxygen reduction on PPO II Nafion modified glassy carbon electrode surface has been observed by square-wave voltammetry. The cathodic peak has been found to be proportional to the concentration of dissolved oxygen. The optimum salt concentration was 0.2 mol/l. The study of its dependence on pH (4-9) indicates that the reduction of oxygen is accompanied by a one-proton-transfer process. Temperature shows little influence on the cathodic peak. The electrode storage has also been studied to evaluate its stability.
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页码：305 / 312
页数：8
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