Figure 19.

Co-detection of dopamine and DOPAL using a bare electrode and the dopamine waveform. Various concentrations of dopamine and DOPAL were prepared in a solution of buffer and injected into the flow cell and were detection with a bare CFME utilizing the dopamine waveform. Baselines for dopamine and DOPAL were established by testing their detection separately with 5 μM solutions. Several ratios ranging from 1 dopamine : 1 DOPAL to 1 dopamine : 100 DOPAL were prepared. The peak oxidative current of DOPAL and dopamine can somewhat be distinguished from one another. DOPAL appears to create a slight shift in oxidative current from 0.75 V for dopamine to 0.7 for DOPAL enabling some co-detection.