Covalent functionalization of single-walled carbon nanotubes with polytyrosine: characterization and analytical applications for the sensitive quantification of polyphenols.

MARCOS EGUÍLAZ; MIGUEL GONZALEZ-DOMINGUEZ; NANCY F. FERREYRA; ALEJANDRO GUTIÉRREZ; ALEJANDRO ANSÓN-CASAOS; MARÍA T. MARTÍNEZ; FABIANA GUTIERREZ,; JAVIER HERNÁNDEZ-FERRER; GUSTAVO A. RIVAS

ANALYTICA CHIMICA ACTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 0 p. 51 - 59

0003-2670

The work reported here demonstrate the advantages of the covalent functionalization of SWCNT with a polymer rich in electroactive groups, like Polytyr. The polymer makes possible a more efficient dispersion of the carbon nanostructures and better deposition of the resulting dispersions at the glassy carbon surface, while the Tyr residues allow to follow the presence of the CNTs at the electrode surface. The GCE/SWCNT-Polytyr demonstrated to be a highly sensitive sensor for GA successfully used for quantifying polyphenols in tea samples. The new functionalization scheme represents an alternative with an enormous potential for the development of different biosensors for instance based on the the catalytic properties of the oxidation products of tyr without needing to incorporate additional mediators.