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 short communication are described and discussed in the light of the existing literature.
Fabrication and application of Nafion®-modified boron doped diamond electrode as sensor for detecting caffeine
MARTINEZ, Carlos Alberto;FERRO, Sergio;DE BATTISTI, Achille;
2010
Abstract
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 short communication are described and discussed in the light of the existing literature.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
