Abstract
For the first time, an adenine-modified pencil graphite electrode (AD/PGE) was used to determine dopamine in synthetic urine samples. The electrochemical properties of the sensor were analyzed using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV) in aqueous solutions. Phosphate buffer solution (PBS) at different pH levels served as the supporting electrolyte. The modified electrode was characterized with CV, EIS, and scanning electron microscopy (SEM). Optimal square wave voltammetry (SWV) parameters were set for dopamine detection. The calibration curve (10 to 0.1 µM) showed a correlation coefficient of 0.9962. The detection limit was 32.4 nM.
Published Version
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