Detection of Quinine in Phospate Buffered 0,1 M by Using Boron-Doped Diamond Electrodes

This study investigates the electrochemical reduction of quinine (QN) detection using boron-doped diamond electrodes (BDD). Different pulse voltammetry (DPV) of QN in a 0.1 M PB solution exhibits reduction peaks at -0.86 V (vs. Ag/AgCl). Additionally, the effects of pH and scan rate were explored to investigate the reduction mechanism within a potential range of -1.4 V to -0.4 V (vs. Ag/AgCl). Furthermore, a linear calibration curve was observed in the concentration range of 2 μM to 25 μM (R2=0.99) with a detection limit of 0.62 μM (S/B=3).