Figure 7.

The effect of interference tested on bare Pt electrodes and ALT biosensors. (a) Current responses upon sequential additions of 20 µM and 40 µM H₂O₂ (the injection of H₂O₂ is indicated by the solid black arrow) and 250 µM and 500 µM AA (the injection of AA is indicated by the dashed black arrow) tested on bare Pt electrodes (━ gray line) and ALT biosensors (━ black line). The inset plot shows lower current range; (b) Current responses upon sequential additions of 20 µM and 40 µM H₂O₂ (the injection of H₂O₂ is indicated by the solid black arrow) and 5 µM and 10 µM DA (the injection of DA is indicated by the dashed black arrow) tested on bare Pt electrodes (━ gray line) and ALT biosensors (━ black line); (c) Comparison of interferent current responses tested on bare Pt electrodes and ALT biosensors (N = 5).