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Electrocatalytic Oxidation and Determination of Norepinephrine at Poly(Cresol Red) Modified Glassy Carbon Electrode

✍ Scribed by Wei Chen; Xinhua Lin; Hongbin Luo; Liying Huang

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
427 KB
Volume
17
Category
Article
ISSN
1040-0397

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✦ Synopsis

Abstract

A glassy carbon electrode (GCE) was modified with electropolymerized films of cresol red in pHβ€…5.6 phosphate buffer solution (PBS) by cyclic voltammetry (CV). The modified electrode shows an excellent electrocatalytic effect on the oxidation of norepinephrine (NE). The peak current increases linearly with the concentration of NE in the range of 3Γ—10^βˆ’6^–3Γ—10^βˆ’5^β€…M by the differential pulse voltammetry. The detection limit was 2Γ—10^βˆ’7^β€…M. The modified electrode can also separate the electrochemical responses of norepinephrine and ascorbic acid (AA). The separation between the anodic peak potentials of NE and AA was 190β€…mV by the cyclic voltammetry. And the responses to NE and AA at the modified electrode were relatively independent.

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