Abstract
In the present study, a carbon paste electrode chemically modified with gold nanoparticles was used as a sensitive electrochemical sensor for determination of eugenol. The differential pulse voltammetric method was employed to study the behavior of eugenol on this modified electrode. The effect of variables such as percent of gold nanoparticles, pH of solution, accumulation potential and time on voltammogram peak current were optimized. The proposed electrode showed good oxidation response for eugenol in 0.1molL−1 phosphate buffer solution (pH8) and the peak potential was about +285mV (vs. Ag/AgCl). The peak current increased linearly with the eugenol concentration in the range of 5–250μmolL−1. The detection limit was found to be 2.0μmolL−1 and the relative standard deviation was 1.2% (n=7). The effect of interferences on the eugenol peak current was studied. The method has been applied to the determination of eugenol in different real samples, spiked recoveries were in the range of 96%–99%.
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