[Sulfaphenazole binding by p-450 cytochrome of liver microsomes of rats and its effect of cytochrome-p-450-reductase].

Tests set up "in vitro" on the rats' liver microsomes showed that sulfaphenazol, which in an inhibitor of the mixed type N-and O-demethylation, is bound as a substrate of the II type (aniline type). It attenuates spectral changes caused by aniline and vice versa. Sulfaphenazol inhibits the activity of the ADPH cytochrome-P-450-reductase.