Porous Para-aminobenzoic Acid Membrane Prepared by Electrochemical Method and Its Application in Voltammetric Determination of Dopamine

In this paper, we prepared poly para aminobenzoic acid (PABA) membrane on a glassy carbon electrode (GCE) using cyclic voltammetry(CV) following electrochemically degrading to form a porous PABA (PPABA) membrane. The PPABA membrane was characterized using CV technique, scanning electron microscope (SEM) measurements. The PPABA membrane could improve sensitivity of dopamine (DA) and inhibit ascorbic acid (AA) and uric acid (UA) electrochemical oxidation. The PPABA/GCE-based electrohemical sensor displayed a good linear ranges from 0 μM to 30 μM DA with a low detection limits of 1.6 μM DA (S/N=3) in voltammetry measurement. The proposed sensor has the advantages of being simple, reproducible and stable and can be used as a new sensitive electrochemical biosensor for the detection of DA.