Electrodeposition of platinum on poly(glutamic acid) modified glassy carbon electrode for non-enzymatic amperometric glucose detection

A non-enzymatic glucose sensor was fabricated by electrodeposition of Pt onto a poly(glutamic acid) film modified glassy carbon electrode (Pt/PGA/GCE). The electrochemical properties of the proposed sensor were studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and amperometric i-t curve. It is found that the Pt/PGA/GCE exhibits highly electrochemical activity for the oxidation of glucose. Under optimal conditions, the linear response range is 0.05-5.95 mM with a detection limit (S/N = 3) of 0.011 mM. The sensor exhibits good sensitivity, selectivity and reproducibility. The proposed method was successfully applied for the determination of glucose in glucose injection solution.