Graphene Paste Electrode: Analytical Applications for the Quantification of Dopamine,Phenolic Compounds and Ethanol |
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| Authors: | Fabiana Gutierrez Fausto N. Comba Aurélien Gasnier Alejandro Gutierrez Laura Galicia Concepción Parrado María D. Rubianes Gustavo A. Rivas |
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| Affiliation: | 1. INFIQC, Departamento de Físico Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina phone: +54‐351‐4334169/80;2. fax: +54‐351‐4334188;3. Departamento de Química, Universidad Autónoma Metropolitana‐Iztapalapa, CP 09340 México D.?F.;4. Departamento de Química Analítica, Fac. de Ciencias Químicas, Universidad Complutense de Madrid, Madrid, Espa?a |
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| Abstract: | This work reports the analytical applications of a graphene paste electrode (GrPE) for the quantification of dopamine, ethanol and phenolic compounds. Dopamine was detected by differential pulse voltammetry‐adsorptive stripping with medium exchange at submicromolar levels even in the presence of high excess of ascorbic acid and serotonin. The electrocatalytic activity of graphene towards the oxidation of NADH and the reduction of quinones allowed the sensitive amperometric determination of ethanol and phenols using GrPE modified with alcohol dehydrogenase/NAD+ or polyphenol oxidase, respectively, with successful applications in real samples like alcoholic beverages and tea. |
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| Keywords: | Graphene paste electrode Composite electrodes Ascorbic acid Dopamine NADH Enzymatic biosensors Phenol biosensor Ethanol biosensor Polyphenol oxidase Alcohol dehydrogenase |
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