Abstract
A reagentless third generation electrochemical glucose biosensor was fabricated based on wiring the template enzyme glucose oxidase (GOx) with graphene nanoribbons (GN) in order to create direct electron transfer between the co-factor (flavin adenine dinucleotide, FAD) and the electrode. The strategy involved: (i) isolation of the apo-enzyme by separating it from its co-enzyme; (ii) preparation of graphene nanoribbons (GN) by oxidative unzipping of multi-walled carbon nanotubes; (iii) adsorptive immobilization of GNs on the surface of a screen printed carbon electrode (SPCE); (iv) covalent attachment of FAD to the nanoribbons; (v) recombination of the apo-enzyme with the covalently bound FAD to the holoenzyme; and (vi) stabilization of the bio-layer with a thin membrane of Nafion. The biosensor (referred to as GN/FAD/apo-GOx/Nafion/SPCE) is operated at a potential of +0.475 V vs Ag/AgCl/{3 M KCl} in flow-injection mode with an oxygen-free phosphate buffer (pH 7.5) acting as a carrier. The signals are linearly proportional to the concentration of glucose in the range from 50 to 2000 mg⋅L−1 with a detection limit of 20 mg⋅L−1. The repeatability (10 measurements, at 1000 mg⋅L−1 glucose) is ±1.4% and the reproducibility (5 sensors, 1000 mg⋅L−1 glucose) is ±1.8%. The biosensor was applied to the determination of glucose in human serum.
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Acknowledgements
E. M wishes to acknowledge Higher KOS Stipendien for scholarship support from ADA, MEST and Austrian Agency for International Cooperation in Education and Research (OeAD-GmbH), Centre for International Cooperation & Mobility (ICM). E.M. also thanks Michael Stiboller for help and discussions. S.C. and K.K. appreciate financial mobility support by Asea UniNet. The authors thank Prof. W. Kroutil for very fruitful discussion.
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Mehmeti, E., Stanković, D.M., Chaiyo, S. et al. Wiring of glucose oxidase with graphene nanoribbons: an electrochemical third generation glucose biosensor. Microchim Acta 184, 1127–1134 (2017). https://doi.org/10.1007/s00604-017-2115-5
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DOI: https://doi.org/10.1007/s00604-017-2115-5