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Open AccessProceedings

Carbon Screen-Printed Electrode Coated with Poly (Toluidine blue) as an Electrochemical Sensor for the Detection of Tyramine

Center for Water and Environmental Sensors, Donau-Universität Krems, 3500 Krems, Austria
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Presented at the 7th International Electronic Conference on Sensors and Applications, 15–30 November 2020; Available online: https://ecsa-7.sciforum.net/.
Eng. Proc. 2020, 2(1), 51; https://doi.org/10.3390/ecsa-7-08171
Published: 14 November 2020
In the present work the surface modification of a carbon screen-printed electrode by electrochemical polymerization of toluidine blue (TB) for determination of tyramine is described. The electrochemical polymerization of the electrode with TB was done by cyclic voltammetry at a scan rate of 50 mV/s and a potential sweep between ‒0.7 V and 1.0 V in the presence of 0.5 mM TB in an electrolyte solution. At each cycle, the polymer film started to deposit on the carbon screen-printed electrode which was repeated 20 times. For parameter optimization the electrochemical behavior of the modified electrode was analyzed by amperometric methods such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV). A phosphate buffer solution (PBS) was used as an electrolyte for all the amperometric experiments. The electrochemically modified poly-TB-coated carbon-screen-printed electrode showed an oxidation peak potential of tyramine at 0.67 V. The unmodified carbon-screen-printed electrode showed the tyramine oxidation peak potential at 0.9 V. Based on the voltammetric results, it was found that the poly-TB-modified carbon-screen-printed electrode showed higher sensitivity (1.78 µA nM−1 cm−2) than a bare carbon-screen-printed electrode toward tyramine detection. Tyramine in 0.1 M PBS (pH 7.4) was analyzed by cyclic voltammetry from the potential of ‒0.7 to 1.0 V at a scan rate of 50 mV/s. The poly-TB-modified carbon-screen-printed electrode exhibited a linear response between catalytic peak current and tyramine concentration from 0.02 µM to 270.5 µM with a lower detection limit of 0.007 µM (S/N = 3).
Keywords: tyramine; poly (toluidine blue); sensor; polymerization; oxidation potential tyramine; poly (toluidine blue); sensor; polymerization; oxidation potential
MDPI and ACS Style

Chakkarapani, L.D.; Brandl, M. Carbon Screen-Printed Electrode Coated with Poly (Toluidine blue) as an Electrochemical Sensor for the Detection of Tyramine. Eng. Proc. 2020, 2, 51. https://doi.org/10.3390/ecsa-7-08171

AMA Style

Chakkarapani LD, Brandl M. Carbon Screen-Printed Electrode Coated with Poly (Toluidine blue) as an Electrochemical Sensor for the Detection of Tyramine. Engineering Proceedings. 2020; 2(1):51. https://doi.org/10.3390/ecsa-7-08171

Chicago/Turabian Style

Chakkarapani, Lakshmi Devi; Brandl, Martin. 2020. "Carbon Screen-Printed Electrode Coated with Poly (Toluidine blue) as an Electrochemical Sensor for the Detection of Tyramine" Eng. Proc. 2, no. 1: 51. https://doi.org/10.3390/ecsa-7-08171

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