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- W2060864341 abstract "Novel, simple and highly sensitive reagentless amperometric flow-biosensor for respiratory toxins (i.e. azide and cyanide) has been developed by using myoglobin (Mb)-adsorbed carbon-felt (CF), based on the inhibitory event of azide and cyanide on the Mb-catalyzed O2 reduction. The Mb-adsorbed CF (Mb–CF) showed a sufficient bioelectrocatalytic activity for O2 reduction in the potential region from 0 to −0.4 V vs. Ag/AgCl at pH 5.0, due to the direct electron transfer (DET) between Mb-heme and the CF electrode. The heterogeneous electron transfer rate constant (ks) of the electrochemical redox reaction of Mb-heme–Fe(II)/(III) was estimated to be 15.5 s−1. This Mb–CF-catalyzed O2 reduction was reversibly inhibited by azide and cyanide, which bind to sixth coordination position of heme-iron center of Mb. When air-saturated 0.1 M phosphate/citrate buffer (pH 5.0) was used as a carrier under the applied potential of −0.2 V vs. Ag/AgCl, the steady-state current due to the Mb-catalyzed O2 reduction was reversibly inhibited by the injection (200 μl) of azide and cyanide, resulting in peak-shape current responses. The magnitude of the inhibition peak currents linearly increased with increasing concentrations of azide (up to 3 μM) and cyanide (up to 5 μM), and the detection limit of azide and cyanide were found to be 0.12 and 0.23 μM, respectively (S/N = 2). The apparent inhibition constant, K′i, of azide and cyanide were estimated to be 5.71 and 8.95 μM, respectively." @default.
- W2060864341 created "2016-06-24" @default.
- W2060864341 creator A5033632697 @default.
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- W2060864341 date "2012-11-01" @default.
- W2060864341 modified "2023-09-26" @default.
- W2060864341 title "Flow-amperometric biosensor for respiratory toxins using myoglobin-adsorbed carbon-felt, based on an inhibitory effect on bioelectrocatalytic reduction of oxygen" @default.
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- W2060864341 doi "https://doi.org/10.1016/j.electacta.2012.03.031" @default.
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