Abstract
An electrochemical sensor for the detection of aspartame using differential pulse voltammetry (DPV) was developed by modifying a glassy carbon electrode (GCE) with zinc oxide nanoparticles (ZnONPs) dispersed over multiwalled carbon nanotubes (MWCNTs) in dimethylformamide medium. The ZnONPs/MWCNTs/GCE surface area of 12.17mm2 was able to oxidize aspartame at a potential of 1.70V in a phosphate buffer of pH2.0 showing two anodic peaks at 0.398V and 1.491V. The characterization of nanocomposite was carried out using transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and cyclic voltammetry (CV). The sensitivity and detection limits obtained with the modified electrode was four-fold greater than that of the unmodified electrode and the concentration of aspartame was found to be 40.36μM, 27.92μM and 44.30μM in Coke zero, Huletts and Sprite zero respectively. The developed method was successfully applied for the determination of aspartame in food samples with a 96% confidence level.
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