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Determination of Serotonin on a Glassy Carbon Electrode Modified by Electropolymerization of Meso-Tetrakis(2-aminophenyl)porphyrin and Single Walled Carbon Nanotubes

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A chemically modified electrode [poly(TAPP)-SWNT/GCE] was prepared by electropolymerization of meso-tetrakis(2-aminophenyl)porphyrin (TAPP)-single walled carbon nanotubes (SWNT) on the surface of a glassy carbon electrode (GCE). This modified electrode was employed as an electrochemical biosensor for the determination of serotonin concentration and exhibited a typical enhance effect on the current response of serotonin and lower oxidation overpotential. The biosensor was very effective to determined 5-HT in a mixture. The linear response was in the range 2.0 × 10−7 to 1.0 × 10−5 M, with a correlation coefficient of 0.999 [ip (μA) = 3.406 C (μM) + 0.132] on the anodic current, with a detection limit of 1 × 10−9 M. Due to the relatively low currents and different potentials in the electrochemical responses to ascorbic acid and dopamine, the modified electrode is a useful and effective sensing device for the selective and sensitive serotonin determination in the presence of ascorbic acid and dopamine.
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Keywords: BIOSENSOR; MESO-TETRAKIS(2-AMINOPHENYL)PORPHYRIN; MODIFIED ELECTRODE; SEROTONIN; SINGLE WALLED CARBON NANOTUBES

Document Type: Research Article

Publication date: 2011-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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