Natural gum-assisted phthalocyanine immobilization in electroactive nanocomposites: Physicochemical characterization and sensing applications
Nenhuma Miniatura disponível
Data
2007-11-01
Autores
Zampa, Maysa F.
de Brito, Ana Cristina F.
Kitagawa, Igor L.
Constantino, Carlos J. L.
Oliveira, Osvaldo N.
da Cunha, Helder N.
Zucolotto, Valtencir
dos Santos, Jose Ribeiro
Eiras, Carla
Título da Revista
ISSN da Revista
Título de Volume
Editor
Amer Chemical Soc
Resumo
Natural gums have been traditionally applied in cosmetics and the food industry, mainly as emulsification agents. Due to their biodegradability and excellent mechanical properties, new technological applications have been proposed involving their use with conventional polymers forming blends and composites. In this study, we take advantage of the polyelectrolyte character exhibited by the natural gum Chicha (Sterculia striata), extracted in the Northeastern region of Brazil, to produce electroactive nanocomposites. The nanocomposites were fabricated in the form of ultrathin films by combining a metallic phthalocyanine (nickel tetrasulfonated phthalocyanine, NiTsPc) and the Chicha gum in a tetralayer architecture, in conjunction with conventional polyelectrolytes. The presence of the gum led to an efficient adsorption of the phthalocyanine and enhanced the electrochemical response of the films. Upon combining the electrochemical and UV-vis absorption data, energy diagrams of the Chicha/NiTsPc-based system were obtained. Furthermore, modified electrodes based on gum/phthalocyanine films were able to detect dopamine at concentrations as low as 10(-5) M.
Descrição
Palavras-chave
Como citar
Biomacromolecules. Washington: Amer Chemical Soc, v. 8, n. 11, p. 3408-3413, 2007.