INFIQC 05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Electrochemical sensing of uric acid using glassy carbon electrodes modified with multiwall carbon nanotubes dispersed in polyethylenimine
Autor/es:
ALEJANDRO GUTIÉRREZ,; MARÍA L. LOZANO; LAURA GALICIA; NANCY FERREYRA; GUSTAVO A. RIVAS
Revista:
ELECTROANALYSIS
Editorial:
WILEY-V C H VERLAG GMBH
Referencias:
Lugar: Weinheim; Año: 2014 vol. 26 p. 2191 - 2196
ISSN:
1040-0397
Resumen:
This work reports the advantages of using glassy carbon electrodes (GCE) modified with multiwall carbon nanotubes (MWCNT) dispersed in polyethylenimine (PEI). The presence of MWCNTs wrapped by PEI largely facilitated the strong adsorption of uric acid (UA) and allowed its highly sensitive and selective quantification even in the presence of high excess of ascorbic acid. The selected conditions for the electrochemical sensing were 5.0 s of accumulation at -0.300V under stirring conditions and quantification in a 0.050M phosphate buffer solution pH 7.40 by differential pulse voltammetry adsorptive-stripping after medium exchange. The platform allowed the successful application for the quantification of UA in urine.
