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Fabrication and application of Nafion ®-modified boron-doped diamond electrode as sensor for detecting caffeine

Martínez-Huitle, C.A. ; Suely Fernandes, N. ; Ferro, S. ; De Battisti, A. ; Quiroz, M.A.

Diamond and related materials, 2010-10, Vol.19 (10), p.1188-1193 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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Título:
Fabrication and application of Nafion ®-modified boron-doped diamond electrode as sensor for detecting caffeine
Autor: Martínez-Huitle, C.A. ; Suely Fernandes, N. ; Ferro, S. ; De Battisti, A. ; Quiroz, M.A.
Assuntos: Caffeine ; Chemistry ; Cyclic voltammetry ; Diamond electrode ; Electrochemistry ; Electrodes: preparations and properties ; Exact sciences and technology ; General and physical chemistry ; General equipment and techniques ; Instruments, apparatus, components and techniques common to several branches of physics and astronomy ; Modified electrode ; Nafion ; Physics ; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
É parte de: Diamond and related materials, 2010-10, Vol.19 (10), p.1188-1193
Descrição: The surface of boron-doped diamond (BDD) electrodes has been modified by Nafion ®. The polymer film was applied onto the BDD electrode surface by solvent evaporation. Nafion ®-BDD electrode was used as a sensor for caffeine detection in e.g. cola beverage samples. In cyclic voltammetric measurements, favorable ionic interaction between the Nafion ® film and caffeine enhances the current response, and thus the sensitivity, compared to that at the bare electrode. The modified electrode exhibits a stable and sensitive response to caffeine and may represent a new analytical tool, offering a significant improvement over other electroanalytical methods (e.g.: Nafion ®-modified glassy carbon electrode) and the accepted method for caffeine analysis (HPLC-MS). The analysis of residuals from the linear regression proved that a linear response exists from 2.0 × 10 − 7 to 1.2 × 10 − 5 M, obtaining a limit of detection of about 1.0 × 10 − 7 M. The findings presented in this study are described and discussed in the light of the existing literature.
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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Fabrication and application of Nafion ®-modified boron-doped diamond electrode as sensor for detecting caffeine

Martínez-Huitle, C.A. ; Suely Fernandes, N. ; Ferro, S. ; De Battisti, A. ; Quiroz, M.A.

Amsterdam: Elsevier B.V

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