Hepatic drug hydroxylation and lipid peroxidation in riboflavin-deficient rats

The effect of riboflavin deficiency and phenobarbital pretreatment on drug hydroxylation and lipid peroxidation was investigated. A significant decrease in aniline and acetanilide hydroxylation as well as NADPH-linked and ascorbate-induced lipid peroxidation was observed during 4- and 7-week riboflavin deficiency in both adult male and adult female rats. The drug-hydroxylation and lipid-peroxidation activities were further lowered with the increase in riboflavin deficiency. The phenobarbital pretreatment induced aniline and acetanilide hydroxylase activity even in riboflavin-deficient animals. Drug hydroxylation inhibits lipid peroxidation in both deficient and normal rats. The administration of riboflavin was followed by a significant increase in drug hydroxylation and lipid peroxidation.

Ionization of Hydrofluoric Acid at 25 °C

The ionization constant, K 1, for the reaction HF⇄H+ + F- was calculated on the basis of potentiometric measurements in the cell Ag; AgCl, Cl-, F-∥LaF3∥NaF, HCl, H2O∣KCl(Satd.), Hg2Cl2; Hg at 25 °C. A least squares procedure was applied to the experimental data yielding a best estimate for K 1 of 5.85 × 10-4 with a standard error of 0.03 × 10-4.