Optimization of square wave voltammetry parameters by response surface methodology for the determination of Sunset yellow using an electrochemical sensor based on Purpald

A modified electrode (Purpald (R)/GC) was prepared by electrochemical deposition of 4-Amino-5-hydrazino-1,2,4-triazole-3-thiol (Purpald (R)) on the glassy carbon electrode surface to determine sunset yellow (SY). The sensor was characterized by Fourier transform infrared spectroscopy, scanning electron microscope with energy dispersive X-ray spectrometer attached, and electrochemical techniques. Optimum experimental conditions were determined for the determination of SY. To obtain better analytical performance on the Purpald (R)/GC sensor, the response surface methodology experimental design was used. The square wave voltammetry technique's pa-rameters were optimized to obtain the highest anodic peak current of SY. The working range was obtained as three linear concentration ranges were 4.97 nM-1.18 mu M, 1.18 mu M-15.16 mu M, and 15.16 mu M-0.153 mM. The LOD value was found as 1.15 nM with the optimum parameters combination. Using the proposed sensor, SY con-centration was determined with satisfactory results in instant powder drink and orange-flavored carbonated drink samples.

Automated summary

In this paper, a modified electrode was used to determine sunset yellow by electrochemical deposition. The optimal experimental conditions were determined and the analytical performance of the sensor was improved using response surface methodology. The proposed sensor showed satisfactory results in determining sunset yellow concentration in instant powder drink and orange-flavored carbonated drink samples.