Electrochemical Sensing Platform based on Greenly Synthesized Gum Arabic Stabilized Silver Nanoparticles for Hydrogen Peroxide and Glucose


 Gum Arabic stabilized silver nanoparticles were successfully synthesized by a one step green synthesis method. The as-prepared nanoparticles were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy, tunneling electron microscopy (TEM), and UV-Vis spectroscopy. XRD data confirmed that the synthesized Ag nanoparticles were face-centred cubic and the crystallite size was calculated to be around 5 nm. TEM imaging confirmed the successful synthesis of monodispersed spherical nanoparticles with the particle size in the range 10-20 nm. Cyclic voltammetry experiments revealed the outstanding electrochemical response and electrocatalytic behaviour of GA-Ag NPs for the sensing of hydrogen peroxide. Based on the cyclic voltammetry, amperometric, and differential pulse voltammetric experiments, it was concluded that strong oxidizing agent H2O2 undergoes through reduction process at the surface of GA-Ag NPs/GCE. Excellent electrocatalytic behaviour of the GA-Ag NPs was exhibited for sensing of glucose also. The limit of detection as calculated from DPV experiments were 0.242 and 0.205 M for H2O2 and glucose, respectively. The reported electrochemical sensor has numerous advantages such as simple and green synthesis method, extremely high sensitivity, stability and reproducibility, and extremely good response.