A Sensitive Determination of Rutin at Fe3O4@SiO2 (FS-MCPE)- A Voltammetric Study

An electrochemical sensor was developed by decorating a newly synthesized iron oxide magnetite nanoparticle capped silica dioxide (Fe3O4@SiO2 microspheres) on the surface of carbon paste electrode. The developed sensor was further used in the electrochemical determination of Rutin (Vitamin P). Cyclic and differential pulse voltammetric methods were carried out to study the kinetic parameters and the quantitative determination of Rutin respectively. Phosphate buffer solution (0.1 M) with pH 7.5 was used as supporting electrolyte in the present investigation. Various parameters like effect of pH, effect of concentration and effect of scan rate were studied in a systematic manner. A set of cyclic voltammogram redox peaks of Rutin was appeared at 397.2 mV (Epa) and 367.8 mV (Epc). The anodic peak currents were linearly increased with increase in the concentration of Rutin with a dynamic range of 1.6×10−6-1.6×10−5 M. The detection limit was calculated and found to be 1.43×10−6 M. Electrochemical parameters viz., number of electrons transferred (n), electrode reaction rate constant (ks), and the charge transfer coefficient (α), were calculated and found to be 2.0, 0.00149 and 1.09 respectively. Further the developed novel electrochemical sensor was successfully applied for the determination of real samples analysis. The results concluded that the Fe3O4@SiO2 modified carbon paste electrode (FSMCPE) has showed the long lasting stability, high sensitivity and low detection limits, towards the determination of Rutin.