SiO2@Fe3O4 Nanocomposite Decorated Graphene Modified Carbon Ionic Liquid Electrode as an Electrochemical Sensor for the Determination of Tyrosine

SiO2@Fe3O4/GR nanocomposite decorated graphene modified carbon ionic liquid electrode (SiO2@Fe3O4/GR/IL/CPE) was prepared. The electrochemical behavior of tyrosine was studied in 0.1 M phosphate buffer solution (PBS) of pH 7.0 using cyclic voltammetry (CV) while differential pulse voltammetry (DPV) was used for quantification. Under optimum condition, the DPV response offered linear dynamic range for tyrosine in the concentration range 1.0×10−6 M–8.0×10−4 M with detection limit 5.0×10−7 M (S/N=3). The method was successfully applied for determination of tyrosine in real samples.