Improvement of the Selectivity of Amperometric Biosensors by Using a Permselective Electropolymerized Film
作者:
C.A. Groom,
J.H. T. Luong,
期刊:
Analytical Letters
(Taylor Available online 1993)
卷期:
Volume 26,
issue 7
页码: 1383-1390
ISSN:0003-2719
年代: 1993
DOI:10.1080/00032719308017419
出版商: Taylor & Francis Group
关键词: electrodeposition;dichlorophenolindophenol;resorcinol;diaminobenzene;glucose;glucose oxidase;uric acid;ascorbic acid;acetaminophen;biosensor
数据来源: Taylor
摘要:
Dichlorophenolindophenol (DCPIP) was electrochemically deposited onto the surface of glassy carbon and platinum electrodes to form a permselective film. Cyclic voltammetry of the DCPIP coated electrode exhibited a reversible oxidation/reduction current at +0.14 V, behavior similar to monomeric DCPIP. However, such an electrode did not mediate glucose oxidase in the presence of β-D-glucose. For operation at +0.7 V vs Ag/AgCl, the DCPIP electrodeposited film behaved like a permselective membrane and virtually eliminated oxidative interference currents resulting from 0.2 mM acetaminophen, uric acid and glutathione. For ascorbic acid, interfering current due to 0.2 mM ascorbate was decreased by 80%. Improvement of the selectivity due to ascorbic acid was achieved using an electrodeposited film prepared from a mixture of DCPIP with diaminobenzene or resorcinol.
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