Fig. 4From: Kinetic characterization of acetone monooxygenase from Gordonia sp. strain TY-5Reduction potential measurement of GSTACMO. a The combined absorbance spectra of GSTACMO and indigo disulfonate as both species are slowly reduced with xanthine/xanthine oxidase. The standard reduction potential value of the enzyme (E°), calculated from the y-intercept of the plot of log (Ered/Eox) versus log (Dred/Dox) shown in b, is − 166 mV ± 1 mVBack to article page