Figure 10: Differential pulse voltammograms of (a) 0.0 M (b) 0.5 × 10-4 (c) 1.0 × 10-4 (d) 1.47 × 10-4 (e) 1.92 × 10-4 (f) 2.35 × 10-4 (g) 2.77 × 10-4 (h) 3.18 × 10-4(i) 3.57 × 10-4 M DA in 0.2 M PBS of pH 7.4 in presence of 1.0 × 10-3 M AA, 0.5× 10-3 M UA at poly (brilliant blue) MCPE..