Voltammetric Determination of Epinephrine in Pharmaceutical Sample with a Tyrosinase Nanobiosensor

Figure 5

Plot of versus pH values. (a) 5.0; (b) 6.0; (c) 7.0; and (d) 8.0 (electrode: CP/MWCNT/Tyr/Nafion biosensor; MWCNT: 1% (w/w); supporting electrolyte: 50 mM phosphate buffer, pH 7.0; scan rate: 50 mV/s; Nafion: 5 µL; Tyr: 313.087 U/mL; and EP:  M).