Abstract
A method for immobilizing proteins in a carbon mesoporous material (CMM) containing platinum nanoparticles (Pt-NPs) is demonstrated. Compared to pure CMM or carbon nanotubes, CMM containing Pt-NPs enhances the electron transfer and redox properties of redox enzymes, such as glucose oxidase (GOx), due to a cooperative effect of Pt-NPs and CMM. The quasi-reversible electron transfer of GOx in this system is probed, and the apparent heterogeneous electron transfer rate constants are found to be 66% larger than in pure CMM. The GOx/Pt-CMM based glucose biosensor enables the determination of glucose at a potential of 600 mV (vs. SCE). Its detection limit is 10 times lower, and the sensitivity is 16 times higher than that of the respective biosensor without Pt-NPs.
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Acknowledgements
This study was supported by the NNSF of China (20775016), Shanghai Leading Academic Discipline Project B108, B109, STCSM 09JC1402600 and Shuguang Project 06SG02.
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You, C., Li, X., Zhang, S. et al. Electrochemistry and biosensing of glucose oxidase immobilized on Pt-dispersed mesoporous carbon. Microchim Acta 167, 109 (2009). https://doi.org/10.1007/s00604-009-0228-1
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DOI: https://doi.org/10.1007/s00604-009-0228-1