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• W2078484465 abstract "The highly ordered mesoporous niobium oxides fabricated by self-adjusted synthesis have been used as immobilization matrices of heme proteins including Cytochrome c (Cyt C) and horseradish peroxidase (HRP) for their large surface areas, narrow pore size distributions and good biocompatibility. The assembling process was investigated by cyclic voltammetry, amperometry and potential step chronoamperometry in details. Niobium oxide matrices with different structural features were templated with the surfactants and the selectivity of these hosts to specific protein characteristics was determined. It was observed that proteins could be readily assembled onto the mesoporous films with detectable retention of bioactivity. The Nb2O5 matrix with a tailored pore size and counterpoised surface charge to that of hemes allowed for a maximum adsorption capacity of biomolecules. The adsorbed redox molecules exhibited direct electrochemical behavior and gave a pair of well-defined quasi-reversible cyclic voltammetric peaks, indicating that the mesoporous niobium oxide matrix could effectively promote the direct electron transfer between the protein redox site adsorbed and the electrode surface. The midpoint redox potentials of adsorbed Cyt-c and HRP were 14 and −122 mV versus SCE, respectively. Furthermore, the immobilized HRP onto Nb2O5 derived electrode presented good bioactivity and thus was fabricated as an amperometric biosensor for the response of hydrogen peroxide in the range from 0.1 μM to 0.1 mM." @default.
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• W2078484465 date "2004-08-01" @default.
• W2078484465 modified "2023-09-22" @default.
• W2078484465 title "Electrochemistry and biosensing reactivity of heme proteins adsorbed on the structure-tailored mesoporous Nb2O5 matrix" @default.
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• W2078484465 doi "https://doi.org/10.1016/j.aca.2004.05.061" @default.
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