期刊
BIOSENSORS & BIOELECTRONICS
卷 54, 期 -, 页码 455-461出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.11.033
关键词
Biofuel cell; Self-powered sensor; Ascorbic acid; Prussian blue; Electrochromism; Carbon nanotubes
类别
资金
- European Regional Development Fund within the Innovative Economy Operational Programme Grants for innovation
- Polish Ministry of Science and Higher Education [IP2011 020771]
- European Union within the European Regional Development Fund, through the grant Innovative Economy [POIG.01.01.02-00-008/08]
We report on the development of a nanocarbon based anode for sensing of ascorbic acid (AA). The oxidation of AA on this anode occurs at a quite low overpotential which enables the anode to be connected to a biocathode to form an ascorbic acid/O-2 biofuel cell that functions as a self-powered biosensor. In conjunction with a Prussian blue electrochromic display the anode can also work as a truly self-powered sensor. The oxidation of ascorbic acid at the anode leads to a reduction of the Prussian blue in the display. The reduced form of Prussian blue, called Prussian white, is transparent. The rate of change from blue to colourless is dependent on the concentration of ascorbic acid. The display can easily be regenerated by connecting it to the biocathode which returns the Prussian blue to its oxidized form. In this way we have created the first self-powered electrochromic sensor that gives quantitative information about the analyte concentration. This is demonstrated by measuring the concentration of ascorbic acid in orange juice. The reported quantitative read-out electrochromic display can serve as a template for the creation of cheap, miniturizable sensors for other relevant analytes. (C) 2013 Elsevier B.V. All rights reserved.
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