Fig. 4

DP voltammogram of different modifications of CPE on oxidation peak height of 198.0 ng/mL (3.9 × 10–4 M) of TIR in 0.04 M BR buffer pH 4.0
DP voltammogram of different modifications of CPE on oxidation peak height of 198.0 ng/mL (3.9 × 10–4 M) of TIR in 0.04 M BR buffer pH 4.0