Electrochemical Behavior of Epinephrine at a Glassy Carbon Electrode Modified by Electrodeposited Films of Caffeic Acid

• Main Authors: Nian Bing Li, Hong Qun Luo, Wang Ren
• Format: Article
• Language: English
• Published: MDPI AG 2006-02-01
• Series: Sensors
• Subjects: Caffeic acid; Electrodeposited films; Epinephrine; Chemically modified electrode
• Online Access: http://www.mdpi.com/1424-8220/6/2/80/
• ISSN: 1424-8220

A stable electroactive thin film of poly(caffeic acid) has been deposited on thesurface of a glassy carbon electrode by potentiostatic technique in an aqueous solutioncontaining caffeic acid. The voltammetric behavior of epinephrine (EP) at the poly(caffeicacid) modified glassy carbon electrode was studied by cyclic voltammetry. The poly(caffeicacid) modified electrode exhibited a promotion effect on the oxidation of EP. In a pH 7.4phosphate buffer, the anodic current increased linearly with the concentration of EP in therange from 2.0 × 10−6 to 3.0 × 10−4 mol L−1 and the detection limit for EP was 6.0 × 10−7mol L−1. The proposed method can be applied to the determination of EP in practicalinjection samples with simplicity, rapidness and accurate results.