Supramolecular architecture based on the self-assembling of multiwall carbon nanotubes dispersed in polyhistidine and glucose oxidase: Characterization and analytical applications for glucose biosensing

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• 作者：Pablo R. Dalmasso ; Mar¨ªa L. Pedano ; Gustavo A. Rivas
• 关键词：Carbon nanotubes dispersion ; Polyhistidine ; Glucose oxidase ; Layer-by-layer ; Self-assembly ; Electrochemical glucose biosensor
• 刊名：Biosensors and Bioelectronics
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：39
• 期：1
• 页码：76-81
• 全文大小：421 K

文摘

We report for the first time the development of a sensitive and selective glucose biosensor based on the self-assembling of multiwall carbon nanotubes (MWCNTs) dispersed in polyhistidine (Polyhis) and glucose oxidase (GOx) on glassy carbon electrodes (GCE). The supramolecular architecture was characterized by SEM, FT-IR and electrochemical techniques. The optimum multistructure was obtained with five (MWCNT-Polyhis/GOx) bilayers and one layer of Nafion as anti-interferent barrier. The sensitivity at 0.700 V was (1.94¡À0.03) mA M^?1 (r=0.9991), with a linear range between 0.25 and 5.00 mM, a detection limit of 2.2 ¦ÌM and a quantification limit of 6.7 ¦ÌM with minimum interference from lactose (1.5 % ), maltose (5.7 % ), galactose (1.2 % ), ascorbic acid (1.0 % ), and uric acid (3.3 % ). The biocatalytic layer demonstrated to be highly reproducible since the R.S.D. for 10 successive amperometric calibrations using the same surface was 3.6 % . The sensitivity of the biosensor after 15 day storage at 4 ¡ãC remained at 90 % of its original value. The combination of the excellent dispersing properties and polycationic nature of polyhistidine, the stability of the MWCNT-Polyhis dispersion, the electrocatalytic properties of MWCNTs, the biocatalytic specificity of GOx, and the permselective properties of Nafion have allowed building up a sensitive, selective, robust, reproducible and stable glucose amperometric biosensor for the quantification of glucose in milk samples.