Application of Mesoporous SiO₂-Modified Carbon Paste
Electrode for Voltammetric Determination of Epinephrine¹

Hongchao Yi^z, Zixian Li, and Kehua Li

College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China

Received February 28, 2011

Abstract—Mesoporous SiO₂ of SBA-15 is reported to modify carbon paste electrodes for detecting epinephrine
(EP). Carbon paste electrodes modified with synthesized SBA-15 show high sensitivity for voltammetric determi-
nation of EP, which is attributed to the strong adsorption ability of SBA-15 to EP and large surface area of the
working electrode resulted from SBA-15 modification. The effects of pH value, amount of SBA-15 and scan rate
were investigated. Under optimum conditions, the anodic peak current of EP was proportional to its concentration
over the range from 1.0 10^–6 to 6.0 10^–5 mol L^–1 and the limit of detection was 6.0 10^–7 mol L^–1. The results
show mesoporous SiO₂-modified carbon paste electrodes, particularly SBA-15-modificd electrodes, create new
opportunities for sensitive, simple and suitable method in the electrochemical analysis of EP.

Keywords: SBA-15, modified electrode, epinephrine, cyclic voltammetry

DOI: 10.1134/S1023193512080046

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