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Effect of SOD and the XnO-Xn system on quinone production rates during oxidation of MBQH2 and DBQH2 by laccase. The reactions were carried out in 20 mM phosphate buffer, pH 5, containing 500 μM hydroquinones (control), 100 U of SOD/ml, 100 mU of XnO/ml, and 250 μM Xn. Heat-denatured enzymes were used in blanks. Means and 95% confidence limits of five replicates are shown.
