Determination of L-arginine in dietary supplement by voltammetry on glassy carbon electrode

A simple and sensitive voltammetric method was developed to determine of L-arginine in a dietary supplement at glassy carbon electrode in 0.1 M sodium hydroxide with pH = 13.0. The L-arginine was pre-accumulated on the electrode surface at +0.3 V for 30 s. A well-defined oxidation peak was obtained at 0.9 V. Differential pulse voltammetry was applied for the calibration plot and detection limit (1.34x10(-6) mol L-1).