Abstract
Cysteamine core polyamidoamine G-4 dendron branched with β-cyclodextrins was chemisorbed on the surface of Au electrodes and further coated with Pt nanoparticles. Adamantane-modified glucose oxidase was subsequently immobilized on the nanostructured electrode surface by supramolecular association. This enzyme electrode was used to construct a reagentless amperometric biosensor for glucose, making use of the electrochemical oxidation of H2O2 generated in the enzyme reaction. The amperometric response of the biosensor was rapid (6 s) and a linear function of glucose concentration between 5 and 705 μmol L−1. The biosensor had a low detection limit of 2.0 μmol L−1, sensitivity of 197 mA mol−1 L cm−2, and retained 94 % of its initial response after storage for nine days at 4 °C.
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Acknowledgements
R. Villalonga acknowledges the Ramón and Cajal contract from the Spanish Ministry of Science and Innovation. Financial support from the Spanish Ministry of Science and Innovation (CTQ2011-24355, CTQ2009-12650, CTQ2009-09351) and Comunidad de Madrid S2009/PPQ-1642, programme AVANSENS, are gratefully acknowledged.
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Published in the topical collection in Bioelectroanalysis with guest editors Nicolas Plumeré, Magdalena Gebala, and Wolfgang Schuhmann.
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Díez, P., Piuleac, CG., Martínez-Ruiz, P. et al. Supramolecular immobilization of glucose oxidase on gold coated with cyclodextrin-modified cysteamine core PAMAM G-4 dendron/Pt nanoparticles for mediatorless biosensor design. Anal Bioanal Chem 405, 3773–3781 (2013). https://doi.org/10.1007/s00216-012-6491-8
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DOI: https://doi.org/10.1007/s00216-012-6491-8