Abstract
An amperometric biosensor for hydrogen peroxide (H2O2) has been constructed by immobilizing cytochrome c on an indium/tin oxide (ITO) electrode modified with a macroporous material. Cyclic voltammetry showed that the direct and quasi-reversible electron transfer of cytochrome c proceeds without the need for an electron mediator. A surface-controlled electron transfer process can be observed with an apparent heterogeneous electron-transfer rate constant (ks) of 29.2 s−1. The biosensor displays excellent electrocatalytic responses to the reduction of H2O2 to give amperometric responses that increase steadily with the concentration of H2O2 in the range from 5 μM to 2 mM. The detection limit is 0.61 μM at pH 7.4. The apparent Michaelis-Menten constant (Km) of the biosensor is 1.06 mM. This investigation not only provided a method for the direct electron transfer of cytochrome c on macroporous materials, but also established a feasible approach for durable and reliable detection of H2O2.

Biosensor for hydrogen peroxide was developed by immobilizing cytochrome c in the macroporous ordered silica foam (MOSF) through the electrostatic interaction. The achievement of the direct electron transfer between cytochrome c and electrode surface indicated that the MOSF modified electrode displayed good affinity and biocompatibility for cytochrome c.
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Acknowledgements
This work is supported by NSFC 20925517, STCSM (10XD1406000, 09JC1402600) and Shanghai Leading Academic Discipline B109.
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Ying Wang and Kun Qian contributed equally to this work.
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Wang, Y., Qian, K., Guo, K. et al. Electrochemistry and biosensing activity of cytochrome c immobilized in macroporous materials. Microchim Acta 175, 87–95 (2011). https://doi.org/10.1007/s00604-011-0638-8
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DOI: https://doi.org/10.1007/s00604-011-0638-8