Electrochemical Determination of Resveratrol Using Multi-Walled Carbon Nanotubes-Modified Glassy Carbon Electrode

Multi-walled carbon nanotubes (MWCNT) were successfully dispersed into water in the presence of dihexadecyl hydrogen phosphate (DHP). After evaporating water, a homogeneous MWCNT-DHP composite film was modified on the surface of glassy carbon electrode (GCE), which was characterized using scanning electron microscopy. The electrochemical behavior of resveratrol was studied, and a sensitive oxidation peak appeared at 0.26 V in pH 7 phosphate buffer. Compared with the bare GCE, the MWCNT-modified GCE greatly increased the oxidation signal of resveratrol, showing remarkable electrochemical enhancement effect. The influences of pH value, amount of MWCNT, accumulation potential and time were studied. As a result, a novel electrochemical method was developed for the determination of resveratrol. The linear range was from 25 mu g L-1 to 4 mg L-1, and the limit of detection was 10 mu g L-1 (4.38 x 10(-8) M) after 3-min accumulation. Finally, this method was successfully used to detect the content of resveratrol in red wine samples, and the recovery was over the range from 96.8% to 98.4%.