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The relative increase of the 7-ethoxycoumarin-O-deethylase and the 6,7-dimethoxycoumarin- O-demethylase activities were found 93 and 236% using a reconstituted cytochrome P 4502B 1 :NADPH-P450 reductase system by adding to the reaction mixtures their own products. The assays were irradiated during the reactions with the excitation wavelength maximum of their products umbelliferone (λ E  = 365 nm) or scopoletin (λ E  = 398 nm), respectively. Addition of the products to the reaction mixtures without irradiation (dark reaction) had no activating effect on the specific activities of the 7-ethoxycoumarin-O-deethylase or the 6,7-dimethoxycoumarin-O-demethylase. The relative increase of the specific activities is dependent on the excitation light intensities and was at maximum when the light intensity at the sample cuvette was 0.4 mW/cm 2 .

Product Autofluorescence Activation in the Cytochrome P450 Monooxygenase System