Covalent functionalization of single-walled carbon nanotubes with polytyrosine: Characterization and analytical applications for the sensitive quantification of polyphenols |
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Authors: | Marcos Eguí laz,Alejandro Gutié rrez,Fabiana Gutierrez,Jose Miguel Gonzá lez-Domí nguez,Alejandro Ansó n-Casaos,Javier Herná ndez-Ferrer,Nancy F. Ferreyra,Marí a T. Martí nez,Gustavo Rivas |
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Affiliation: | 1. INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Ciudad Universitaria, 5000 Córdoba, Argentina;2. Grupo de nanoestructuras de carbono y Nanotecnología, Departamento de Nanotecnología, Instituto de Carboquímica (CSIC), 50018 Zaragoza, Spain |
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Abstract: | 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. |
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Keywords: | Single-walled carbon nanotubes Covalent functionalization Polytyrosine Gallic acid |
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