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

Eguilaz, Marcos; Gutierrez, Alejandro; Gutierrez, Fabiana; Miguel Gonzalez-Dominguez, Jose; Anson-Casaos, Alejandro; Hernandez-Ferrer, Javier; Ferreyra, Nancy F.; Martinez, Maria T.; Rivas, Gustavo


This work reports the synthesis and characterization of single-walled carbon nanotubes (SWCNT) covalently functionalized with polytyrosine (Polytyr); the critical analysis of the experimental conditions to obtain the efficient dispersion of the modified carbon nanotubes; and the analytical performance of glassy 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 x 10(-7) and 1.7 x 10(-4) M, with a sensitivity of (518 +/- 5) m AM(-1) cm(-2), and a detection limit of 8.8 nM. The proposed sensor was successfully used for the determination of total polyphenolic content in tea extracts. (C) 2016 Elsevier B.V. All rights reserved.

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Título según WOS: ID WOS:000369093600006 Not found in local WOS DB
Título de la Revista: ANALYTICA CHIMICA ACTA
Volumen: 909
Editorial: Elsevier
Fecha de publicación: 2016
Página de inicio: 51
Página final: 59


Notas: ISI