Journal
ANALYTICA CHIMICA ACTA
Volume 927, Issue -, Pages 35-45Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2016.04.049
Keywords
Poly(brilliant green); Poly(3,4-ethylenedioxythiophene); Carbon nanotubes; Glucose oxidase; Alcohol oxidase; Alcohol dehydrogenase
Categories
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT), Portugal [PTDC/QUI-QUI/116091/2009]
- POCH
- POFC-QREN
- LLP/Erasmus Placement Programme
- FCT [SFRH/BPD/72656/2010]
- FSE
- European Community FEDER funds through the program COMPETE - Programa Operacional Factores de Competitividade [UID/EMS/00285/2013, CENTRO -07-0224 -FEDER -002001 (MT4MOBI)]
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A combination of the electroactive polymer poly(brilliant green) (PBG) or conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) with carbon nanotubes to obtain CNT/PBG and CNT/PEDOT modified carbon film electrodes (CFE) has been investigated as a new biosensor platform, incorporating the enzymes glucose oxidase (GOx) as test enzyme, alcohol oxidase (AlcOx) or alcohol dehydrogenase (AlcDH). The sensing parameters were optimized for all biosensors based on CNT/PBG/CFE, CNT/PEDOT/CFE platforms. Under optimized conditions, both GOx biosensors exhibited very similar sensitivities, while in the case of AlcOx and AlcDH biosensors, AlcOx/CNT/PBG/CFE was found to give a higher sensitivity and lower detection limit. The influence of dissolved O-2 on oxidase-biosensor performance was investigated and was shown to be different for each enzyme. Comparisons were made with similar reported biosensors, showing the advantages of the new biosensors, and excellent selectivity against potential interferents was successfully demonstrated. Finally, alcohol biosensors were successfully used for the determination of ethanol in alcoholic beverages. (C) 2016 Elsevier B.V. All rights reserved.
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