Amperometric sensor based on carbon nanotubes and electropolymerized vanillic acid for simultaneous determination of ascorbic acid,dopamine, and uric acid |
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| Authors: | L V da Silva F A S Silva L T Kubota C B Lopes P R Lima E O Costa W Pinho Júnior M O F Goulart |
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| Institution: | 1.Instituto de Química e Biotecnologia,Universidade Federal de Alagoas, Campus A. C. Sim?es,Maceió,Brazil;2.Instituto Federal de Educa??o,Ciência e Tecnologia de Alagoas, IFAL- Campus Palmeira dos índios,Palmeira dos índios,Brazil;3.Instituto Federal de Educa??o,Ciência e Tecnologia de Alagoas, IFAL,Maceió,Brazil;4.Instituto Federal de Educa??o,Ciência e Tecnologia de Goiás, IFG- campus Urua?u,Urua?u,Brazil;5.Instituto Nacional de Ciência e Tecnologia de Bioanalítica,UNICAMP,Campinas,Brazil |
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| Abstract: | This paper describes the development of a simple and efficient nanostructured platform based on multi-walled carbon nanotubes (MWCNT) functionalized with an in situ generated vanillic acid (VA) polymer. It was used as an analytical sensor for the simultaneous determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). The electropolymerization process of VA, performed on MWCNT-modified glassy carbon electrode, produces three redox systems based on quinone/hydroquinone functionality, as observed by cyclic voltammetry. The amperometric sensor has as figures of merit for the simultaneous determination of AA, DA, and UA the following values: for AA, a linear range of 5–120 μM and detection limit of 3.5 μM; for DA, a linear range of 5–120 μM and detection limit of 4.5 μM; and for UA, a linear range of 5–120 μM and a detection limit of 1.5 μM. From the obtained performance, the development of the platform based on MWCNT/poly-VA is justified for the simultaneous determination of AA, DA, and UA. |
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