Voltammetric Determination of Ferulic Acid Using a GC Electrode Modified with Polyaspartic Acid Film

Abstract:

A novel electrochemical sensor was prepared by direct electropolymerization of DLaspartic acid on the surface of glassy carbon electrode in aqueous media.In pH 4.5,0.1 mol·L-1 HAcNaAc buffer solution,the film modified electrode exhibited excellent adsorption capacity to ferulic acid and improved the electrochemical responses significantly.The action mechanism of modified electrode was preliminarily explored,and a fast analytical method for ferulic acid was established.In the range of 9.1×10-7 to 3.0×10-3 mol·L-1,the differential pulse voltammetric peak current had a linear relationship to the concentration,and the detection limit was estimated to be 3.1×10-7mol·L-1.This method was adopted to detect the trace amount of ferulic acid in Chinese patent medicine of Xiaoyao Pills,and the recovery was from 97.9% to 102.2%.

Key words:ferulic acid; polyaspartic acid modified electrode; electrochemical determination