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Processable enzyme-hybrid conductive polymer composites for electrochemical biosensing
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- Liu, Yu (author)
- Linköpings universitet,Kemi,Tekniska fakulteten,Sichuan Agriculture University, Peoples R China
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- Turner, Anthony (author)
- Linköpings universitet,Sensor- och aktuatorsystem,Tekniska fakulteten
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- Zhao, Maojun (author)
- Sichuan Agriculture University, Peoples R China
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- ELSEVIER ADVANCED TECHNOLOGY, 2018
- 2018
- English.
- In: Biosensors & bioelectronics. - : ELSEVIER ADVANCED TECHNOLOGY. - 0956-5663 .- 1873-4235. ; 100, s. 374-381
- Journal article (peer-reviewed)
Abstract
Subject headings
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- A new approach for the facile fabrication of electrochemical biosensors using a biohybrid conducting polymer was demonstrated using glucose oxidase (GOx) and poly (3, 4-ethylenedioxythiophene) (PEDOT) as a model. The biohybrid conducting polymer was prepared based on a template-assisted chemical polymerisation leading to the formation of PEDOT microspheres (PEDOT-MSs), followed by in-situ deposition of platinum nanoparticles (PtNPs) and electrostatic immobilisation of glucose oxidase (GOx) to form water processable GOx-PtNPs-PEDOT-MSs. The morphology, chemical composition and electrochemical performance of the GOx-PtNPs-PEDOT-MS-based glucose biosensor were characterised using scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), Fourier transform infrared (FTIR) spectroscopy, zeta potential and electrochemical measurements, respectively. The biosensor delivered a linear response for glucose over the range 0.1-10 mM (R-2 = 0.9855) with a sensitivity of 116.25 mu A mM(-1) cm(-2), and limit of detection of 1.55 mu M (3 x SD/sensitivity). The sensitivity of the developed PEDOT-MS based biosensor is significantly higher (2.7 times) than the best reported PEDOT-based glucose biosensor in the literature. The apparent Michaelis Menten constant (K-m(app)) of the GOx-PtNPs-PEDOT-MS-based biosensors was calculated as 7.3 mM. Moreover, the biosensor exhibited good storage stability, retaining 97% of its sensitivity after 12 days storage. This new bio-hybrid conducting polymer combines the advantages of micro-structured morphology, compatibility with large-scale manufacturing processes, and intrinsic biocatalytic activity and conductivity, thus demonstrating its potential as a convenient material for printed bioelectronics and sensors.
Subject headings
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
Keyword
- Bio-conductive composite; PEDOT; Microspheres; Bio-interfaces; Glucose biosensor
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Turner, Anthony
- Zhao, Maojun
- Mak, Wing Cheung
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