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- W2007491012 abstract "A room temperature electron paramagnetic resonance potentiometric cell has been developed for the measurement of oxidation-reduction midpoint potentials of enzymes containing paramagnetic centers. Based upon an aqueous flat cell designed for use with the Varian TM high sensitivity cavity, the apparatus combines a high degree of anaerobiosis with low volume requirements. The cell is simple in design, easily constructed, and can be adapted for use with most spectrometer cavities. Tests of the cell using xanthine oxidase, in 50 mM Bicine buffer, pH 7.7, yielded midpoint potentials of -345 and -371 mV for the Mo(VI)/Mo(V) and Mo(V)/Mo(IV) couples compared with values of -373 and -377 mV obtained by electron paramagnetic resonance analysis of frozen potentiometric samples. These values indicate that shifts, of the order of 20-40 mV, may occur upon freezing poised samples. For the Mo center of xanthine oxidase, these shifts in potential are more pronounced for the Mo(VI)/Mo(V) couple and result in a destabilization of the Mo(V) intermediate during freezing." @default.
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- W2007491012 date "1990-01-01" @default.
- W2007491012 modified "2023-10-18" @default.
- W2007491012 title "Measurement of oxidation-reduction midpoint potentials by room temperature electron paramagnetic resonance potentiometry" @default.
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- W2007491012 doi "https://doi.org/10.1016/0003-2697(90)90003-r" @default.
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