Catalase-Based Modified Graphite Electrode for Hydrogen Peroxide Detection in Different Beverages

Figure 4

CVs of NAF-MWCNTs-COOH-GCE-CAT modified biosensor in the absence (A) and in the presence of 130 µM (B), 215 µM (C), 298 µM (D), and 538 µM (E) of the substrate H₂O₂ (a). Catalytic efficiency changes versus hydrogen peroxide, where and are the cathodic peak currents in the presence and in the absence of H₂O₂, respectively (b). Experimental conditions: deoxygenated PBS buffer solution,  mV s⁻¹.

(a)

(b)