Preparation and characteristics of electrochemical sensor for salicylic acid based on molecularly imprinted polymers

A molecularly imprinted polymer(MIP) film was synthesized on the surface of a glassy carbon electrode with the salicylic acid(SA) as template.Electrochemical oxidation behaviors of SA on the imprinted electrode were investigated by square wave voltammetry.As the incubation time of 7 min,the peak current was proportional to the concentration of SA in the range from 1.0×10-5 to 2.6×10-4 mol/L with a detection limit of 2.0×10-6 mol/L(S/N=3).The RSD of the peak current was 3.7 %(n = 7).The imprinted electrode displayed good specificity.The selective coefficients of structural analogs were 12 and 6.9 for p-hydroxybenzoic acid and p-aminobenzoic acid,respectively.The MIP sensors had been used to determine SA in cosmetic samples with recoveries between 99.9% and 106.7%.