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Electrochemical Sensor Based on Aluminum Tetraaminophthalocyanine and Ionic Liquid Modified Glassy Carbon Electrode for Dopamine Detection in Drugs and Human Serum

In this work, a novel electrochemical sensor for dopamine (DA) detection was designed based on aluminum tetraaminophthalocyanine-ionic liquid (AlTAPc-IL) composite material. The morphologies and structures of the aluminum tetraaminophthalocyanine (AlTAPc) and AlTAPc-IL materials were characterized by scanning electron microscopy (SEM) and ultraviolet-visible (UV-Vis) spectroscopy. The cyclic voltammetry (CV) and differential pulse (DPV) methods were used to study the electrochemical behaviors of dopamine on the tetraamino AlTAPc-IL/GCE electrode. The results showed that the modified electrode has a higher response signal than the bare electrode. In a phosphate buffer solution (PBS) at pH 7.0, the AlTAPc-IL/GCE electrode has good catalytic activity for the oxidation of DA. The peak current increased linearly with DA concentration in the ranges of 0.1-30 μM and 30-500 μM with good correlation coefficients, and the detection limit was 0.38 nM. Due to its high sensitivity, low detection limit and wide linear range, the sensor can be used as an alternative analytical tool for the detection of dopamine in actual samples.