Application of mesoporous SiO2-Modified carbon paste electrode for voltammetric determination of epinephrine

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 determination 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 x 10(-6) to 6.0 x 10(-5) mol L-1 and the limit of detection was 6.0 x 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.