Saffron in KCl Mediated by Glassy Carbon Electrode Using Cyclic Voltammetry

Saffron in aqueous solution was studied via electrochemical analysis with KCl as a supporting electrolyte using cyclic voltammetric technique to determine the redox current peaks at different concentration, pH and scan rate (SR). It was found that an oxidation current peak appeared at potential +268 mV and two reduction current peaks at −282 and −850 mV. The oxidation current peak of saffron disappeared in alkaline medium at pH = 12. An enhancement was observed in acidic medium at pH = 6. Based on Randel equations and by using different scan rates, the diffusion coefficient (D_f) for oxidation-reduction current peaks of saffron in KCl solution was determined with nearly equal values as of 1.87×10⁻⁵ and 1.12×10⁻⁵ cm²/s, respectively. The results indicate a low detection limit of the different concentrations of saffron in KCl solution as determined from the calibration graph, and a high reliability revealed by the relative standard deviation (RSD). Stability of the GCE for oxidation-reduction current peaks was recorded as ± 7.12% and ± 1.04%, respectively.