Supramolecular immobilization of glucose oxidase on gold coated with cyclodextrin-modified cysteamine core PAMAM G-4 dendron/Pt nanoparticles for mediatorless biosensor design
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- Díez, P., Piuleac, CG., Martínez-Ruiz, P. et al. Anal Bioanal Chem (2013) 405: 3773. doi:10.1007/s00216-012-6491-8
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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.