Artículos de revistas
Covalent functionalization of single-walled carbon nanotubes with polytyrosine: Characterization and analytical applications for the sensitive quantification of polyphenols
Fecha
2016-02-25Registro en:
Eguílaz Rubio, Marcos; Gutierrez, Alejandro; Gutierrez, Fabiana Andrea; Gonzalez Dominguez, Jose Miguel; Anson Casaos, Alejandro; et al.; Covalent functionalization of single-walled carbon nanotubes with polytyrosine: Characterization and analytical applications for the sensitive quantification of polyphenols; Elsevier Masson; Analytica Chimica Acta; 909; 25-2-2016; 51-59
0003-2670
CONICET Digital
CONICET
Autor
Eguílaz Rubio, Marcos
Gutierrez, Alejandro
Gutierrez, Fabiana Andrea
Gonzalez Dominguez, Jose Miguel
Anson Casaos, Alejandro
Hernández Ferrer, Javier
Ferreyra, Nancy Fabiana
Martinez, Maria Teresa
Rivas, Gustavo Adolfo
Resumen
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 × 10−7 and 1.7 × 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.