Electrochemical determination of tyrosine in the presence of uric acid at a carbon paste electrode modified with multi-walled carbon nanotubes enhanced by sodium dodecyl sulfate |
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| Authors: | Sayed Mehdi Ghoreishi Mohsen Behpour Mona Delshad Asma Khoobi |
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| Affiliation: | 1. Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, 87317-51167, Islamic Republic of Iran
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| Abstract: | ![]()
Tyrosine (Tyr) was quantitated with high sensitivity and selectivity in the presence of uric acid (UA) using a carbon paste electrode modified with multi-walled carbon nanotubes. Tyr and UA were catalytically oxidized with diffusion-controlled characteristics. They were determined simultaneously by differential pulse voltammetry with a potential difference of 350 mV. The electrocatalytic currents increase linearly with Tyr and UA concentrations 4×10?7?1×10?4 M and 3×10?7?2×10?4 M. Their detection limits were 1×10?7 and 5.1×10?8 M respectively. In the presence of sodium dodecyl sulfate the Tyr detection limit improved from 1×10?7 to 6.9×10?8 M. The electrode was successfully used to quantitate Tyr and UA in serum.  | |
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