Figure 3: Comparison between (a) simulated and (b) experimental electropherograms of a banknote extracted under the optimized conditions. Legend of the peaks: 1: propranolol (I.S.), 2: cocaine, 3: lidocaine. Experimental conditions: capillary 48.5 cm (length to the detector 40 cm); BGE composed of 20 mmol L−1 HIBA and 60 mmol L−1 TRIS at pH 8.4; injection using 50 mbar for 10 s; voltage +25 kV.