Voltammetric Determination of Epinephrine in Pharmaceutical Sample with a Tyrosinase Nanobiosensor

Figure 4

Plot of versus EP concentration at different enzyme activities 156.540 U/mL (red diamond); 313.087 U/mL (black square); and 626.174 U/mL (blue triangle) (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; and EP concentration range:  M to  M).