Abstract
The electrochemistry of glucose oxidase (GOx) immobilized on a graphite rod electrode modified by gold nanoparticles (Au-NPs) was studied. Two types of amperometric glucose sensors based on GOx immobilized and Au-NPs modified working electrode (Au-NPs/GOx/graphite and GOx/Au-NPs/graphite) were designed and tested in the presence and the absence of N-methylphenazonium methyl sulphate in different buffers. Results were compared to those obtained with similar electrodes not containing Au-NPs (GOx/graphite). This study shows that the application of Au-NPs increases the rate of mediated electron transfer. Major analytical characteristics of the amperometric biosensor based on GOx and 13 nm diameter Au-NPs were determined. The analytical signal was linearly related to glucose concentration in the range from 0.1 to 10 mmol L−1. The detection limit for glucose was found within 0.1 mmol L−1 and 0.08 mmol L−1 and the relative standard deviation in the range of 0.1–100 mol L−1 was 0.04–0.39%. The τ1/2 of V max characterizes the storage stability of sensors: this parameter for the developed GOx/graphite electrode was 49.3 days and for GOx/Au-NPs/graphite electrode was 19.5 days. The sensor might be suitable for determination of glucose in beverages and/or in food.
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This work was financially supported by Lithuanian State Science and Studies Foundation project number S-6/2007 and Agency for International Science and Technology Development Programmes in Lithuania for performance of COST program D43.
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German, N., Ramanaviciene, A., Voronovic, J. et al. Glucose biosensor based on graphite electrodes modified with glucose oxidase and colloidal gold nanoparticles. Microchim Acta 168, 221–229 (2010). https://doi.org/10.1007/s00604-009-0270-z
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DOI: https://doi.org/10.1007/s00604-009-0270-z