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- W2078706245 abstract "Cytochrome c was immobilized on a mixed-thiol (mercaptoundecanoic acid/mercaptoundecanol) modified gold electrode (MUA:MU/cyt c electrode). Characterization of the cyt c electrode showed a quasi-reversible, electrochemical redox behavior with a formal potential of −13±5 mV (versus Ag/AgCl) for the surface adsorbed protein and 3±5 mV for covalently immobilized cyt c. The heterogeneous electron transfer rate constants were determined to be about 70 and 40 s−1 for both states of the protein, respectively. They were found to be significantly higher than those of pure MUA-modified cyt c electrodes (MUA/cyt c electrodes). The interaction of superoxide radicals (O2−) with the (MUA:MU)/cyt c electrode was characterized and used for an amperometric O2− detection. The influence of H2O2 and uric acid on the sensor signal was investigated. The sensitivity of the (MUA:MU)/cyt c electrode to O2− was significantly improved compared with that of the MUA/cyt c electrode. Based on a kinetic model for the superoxide detection system, a new calibration method was established. This simple and fast method used the spontaneous dismutation of KO2 and was compared with the enzymatic superoxide generation system using xanthine oxidase." @default.
- W2078706245 created "2016-06-24" @default.
- W2078706245 creator A5026571598 @default.
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- W2078706245 date "2002-03-01" @default.
- W2078706245 modified "2023-10-02" @default.
- W2078706245 title "Superoxide sensor based on cytochrome c immobilized on mixed-thiol SAM with a new calibration method" @default.
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- W2078706245 doi "https://doi.org/10.1016/s0003-2670(01)01545-8" @default.
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