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• W2065508188 abstract "Direct electrochemistry of cytochrome c (Cyt c) is achieved via Zr(IV) ion as an immobilization matrix to interface Cyt c on gold surface via thiol self-assembled monolayers. Steps of surface modification and electrocatalytic activity of the immobilized Cyt c are followed by voltammetry, impedance spectroscopy, chronoampetrometry, and attenuated total reflectance Fourier transform infrared (ATR–FTIR) spectroscopy. The results indicate that the native structure of Cyt c is conserved during the immobilization process. The immobilization method is rather simple, effective and free of immobilizing activators and reagents. Direct electron transfer rate constant and surface coverage of the immobilized Cyt c are found as 8.62(± 1.98) s− 1 and 1.15(± 0.38) × 10− 11 mol cm− 2, respectively. Bioactivity studies of the immobilized Cyt c toward oxidation of the ascorbic acid (AA) substrate show a linear response, from 10.0 μM to 1.30 mM AA, with a detection limit of 5.0(± 1.8) μM AA and mean relative standard deviations varied from 13.7% to 3.7% for n = 4 at each point. A value of 1.6(± 0.8) mM AA is found for the Michaelis–Menten constant of Au-MPA-Zr(IV)-Cyt c toward AA for the first time. The tightly immobilized Cyt c maintains its bioactivity for more than 32 days storage at 4 °C." @default.
• W2065508188 created "2016-06-24" @default.
• W2065508188 creator A5050888320 @default.
• W2065508188 creator A5062823377 @default.
• W2065508188 date "2014-08-01" @default.
• W2065508188 modified "2023-10-16" @default.
• W2065508188 title "Direct electrochemistry of cytochrome c immobilized on gold electrode surface via Zr(IV) ion glue and its activity for ascorbic acid" @default.
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• W2065508188 doi "https://doi.org/10.1016/j.bioelechem.2014.03.004" @default.
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