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

MARCOS EGUÍLAZ, ALEJANDRO GUTIERREZ, FABIANA GUTIERREZ, NANCY F. FERREYRA, , GUSTAVO RIVAS; JOSE MIGUEL GONZALEZ-DOMÍNGUEZ , MARÍA T. MARTÍNEZ, ALEJANDRO ANSON-CASAOS
B, JAVIER HERNANDEZ-FERRER

ANALYTICA CHIMICA ACTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 909 p. 51 - 51

0003-2670

his work reports the synthesis and characterization of single-walled carbon nanotubes (SWCNT)covalently functionalized with polytyrosine (Polytyr); the critical analysis of the experimental conditionsto obtain the efficient dispersion of the modified carbon nanotubes; and the analytical performance ofglassy carbon electrodes (GCE) modified with the dispersion (GCE/SWCNT-Polytyr) for the highly sensitive quantification of polyphenols. Under the optimal conditions, the calibration plot for the amperometric response of gallic acid (GA) shows a linear range between 5.0 107 and 1.7 104 M, with asensitivity of (518 ± 5) m AM1 cm2, and a detection limit of 8.8 nM. The proposed sensor was successfully used for the determination of total polyphenolic content in tea extracts.