Characterization of Mixed Enzyme-Mediator-Carbon Paste Electrodes
作者:
A. Amine,
J.M. Kauffmann,
G.G. Guilbault,
S. Bacha,
期刊:
Analytical Letters
(Taylor Available online 1993)
卷期:
Volume 26,
issue 7
页码: 1281-1299
ISSN:0003-2719
年代: 1993
DOI:10.1080/00032719308017413
出版商: Taylor & Francis Group
关键词: Mediators;Carbon Paste;Ferrocene;Bioelectrodes
数据来源: Taylor
摘要:
Amperometric bioelectrodes based on carbon paste mixed with glucose oxidase (GOX) and dimethylferrocene (DMFc), are characterized by using cyclic voltammetry, potential step chronoamperometry and amperometry at a rotating disk electrode. The catalytic process appears to be highly dependent on the amount of DMFc. Kinetic control, internal diffusion control and external diffusion control can be obtained only by varying the amount of incorporated DMFc. It was shown that the Eadie-Hofstee plot is a particularly useful tool in diagnosis of diffusional limitations. The high efficiency of electrochemical regeneration of high amounts of DMFc* surrounding GOX solves the problem of co-substrate transport. The catalytic oxidation current of ascorbic acid was highly diminished by casting a lipid/Nafion membrane and totally eliminated by treatment of the sample with hydrogen peroxide prior to measurement.
点击下载:
PDF (552KB)
返 回