Abstract
Thiophene substituted porphyrin derivative was synthesized and investigated. The porphyrin derivative was characterized via MALDI-MS, 1H NMR, FT-IR, and cyclic voltammetry methods. The poly-porpyrin (PPor) film was electrochemically deposited on a glassy carbon electrode (GCE) via cyclic voltammetry in phosphate buffer solution (PBS). The electrocatalytic activity of the polymeric porphyrin film-modified electrode (GCE-PPor) was investigated towards dopamine through differential pulse voltammetry (DPV) method. The electrochemical results revealed that GCE-PPor exhibited a better catalytic activity towards dopamine in PBS when compared to an unpolymerized porphyrin-modified electrode. The PPor-modified electrode shows a sensitivity of 5.82 μA μM–1 cm–2 and low detection limit of 0.42 μM with high selectivity in the presence of ascorbic acid (AA) and uric acid (UA) as interferents. The enhancement of the electrocatalytic activity can be explained by the enhanced π-conjugation after polymerization.
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