CuO nanoflowers modified glassy carbon electrode for the electrochemical determination of methionine

This study reported the electrochemical sensor for sensitive determination of methionine based on CuO nanoflowers (CuO NFs) supported on glassy carbon electrode (GCE). Therefore, we utilized cyclic voltammetry (CV), chronoamperometry (CHA) as well as differential pulse voltammetry (DPV) for characterizing the sensor performance. This CuO NFs/GCE has been found to have very good electrochemical catalytic activity toward methionine oxidation. The oxidation overpotential of methionine decreased significantly and its oxidation peak current increased dramatically at CuO NFs/GCE. Moreover, the sensor showed a linear response for detecting methionine in the broad ranges from 1.0-300.0 µM with a low limit of detection (LOD) equal to 0.3 µM. Finally, we employed CuO NFs/GCE as a highly sensitive tool to analyze methionine in real sample (urine).