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天然胶辅助酞菁在电活性纳米复合材料中的固定化:物理化学表征及传感应用

Natural gum-assisted phthalocyanine immobilization in electroactive nanocomposites: physicochemical characterization and sensing applications.

作者信息

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 José Ribeiro, Eiras Carla

机构信息

DQ and DF, UFPI, CCN, 64049-550, Teresina, PI, Brazil.

出版信息

Biomacromolecules. 2007 Nov;8(11):3408-13. doi: 10.1021/bm700528u. Epub 2007 Oct 16.

Abstract

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.

摘要

天然树胶传统上应用于化妆品和食品工业,主要用作乳化剂。由于其生物可降解性和优异的机械性能,人们提出了新技术应用,涉及将其与传统聚合物混合形成共混物和复合材料。在本研究中,我们利用在巴西东北部提取的天然树胶奇查(Sterculia striata)所表现出的聚电解质特性来制备电活性纳米复合材料。通过将金属酞菁(四磺酸镍酞菁,NiTsPc)和奇查树胶以四层结构与传统聚电解质相结合,制备出超薄膜形式的纳米复合材料。树胶的存在导致酞菁的有效吸附,并增强了薄膜的电化学响应。结合电化学和紫外可见吸收数据,获得了基于奇查/ NiTsPc体系的能级图。此外,基于树胶/酞菁薄膜的修饰电极能够检测低至10 - 5 M浓度的多巴胺。

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