title: Metabolism of 3-tert-butyl-4-hydroxyanisole to 3-tert-butyl-4,5-dihydroxyanisole by rat liver microsomes.
abstract: 3-tert-Butylhydroxyanisole (3-BHA) is an antioxidant which can have a modulating effect on chemical carcinogenesis. Information concerning the metabolism of 3-BHA is incomplete. In the present study, the metabolites formed by incubating 3-BHA with liver microsomes from rats given beta-naphthoflavone by p.o. intubation were studied. Three metabolites were identified, two major metabolites and a minor metabolite. One of the major metabolites was the catechol of 3-BHA, i.e., 3-tert-butyl-4,5-dihydroxyanisole, which has not previously been reported. A characteristic of this compound is its capacity to be oxidized readily. The second major metabolite was tert-butyl hydroquinone which has been reported previously to be a liver microsomal metabolite of 3-BHA. The third metabolite, which occurred in small quantities, was 2,2'-dihydroxy-3,3'-di-tert-butyl-5,5'-dimethoxydiphenyl. 2,2'-Dihydroxy-3,3'-di-tert-butyl-5,5'-dimethoxydiphenyl has been identified previously as a major metabolite of 3-BHA in the rat intestine. An understanding of the metabolism of 3-BHA may assist in elucidating the mechanism(s) of its biological effects.
mesh_terms: D000818:Animals; D000840:Anisoles / Q000378:metabolism*; D002083:Butylated Hydroxyanisole / Q000031:analogs & derivatives / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006900:Hydroxylation; D066298:In Vitro Techniques; D008862:Microsomes, Liver / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000840:Anisoles; D002083:Butylated Hydroxyanisole; C044874:3-tert-butyl-4,5-dihydroxyanisole