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Natural Gum-Assisted Phthalocyanine Immobilization in Electroactive Nanocomposites: Physicochemical Characterization and Sensing Applications

2007; American Chemical Society; Volume: 8; Issue: 11 Linguagem: Inglês

10.1021/bm700528u

1526-4602

Maysa F. Zampa, Ana Cristina Facundo de Brito, Igor Lebedenco Kitagawa, Carlos J. L. Constantino, Osvaldo N. Oliveira, Helder Nunes da Cunha, Valtencir Zucolotto, José Ribeiro dos Santos Júnior, Carla Eiras,

Conducting polymers and applications

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 Chichá (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 Chichá 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 Chichá/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.