title: Effect of protein deficiency and Tween 60 on the pharmacokinetics of butylated hydroxyanisole and metabolites in male Sprague-Dawley rats.
abstract: Radioactive 3H-butylated hydroxyanisole (BHA) at dosages of 250 or 2,500 mg/kg body weight was administered to rats either orally (po) or intraperitonealy (ip) with or without 500 mg Tween 60/kg. The pharmacokinetics of 3H-BHA were evaluated in both control and protein-deficient animals. Blood or urine and feces were collected and analyzed for 3H-BHA equivalents. Using the Autoan/Nonlin69 computer program, most pharmacokinetic profiles of BHA (250 mg/kg) were fit to one-compartment open models with first-order absorption. The exception was the model for ip administration, which resulted in a two-compartment open model with first-order absorption. Increasing the dose of BHA to 2,500 mg/kg altered pharmacokinetics of BHA; no decline in blood levels was observed 48 hours post-injection. Protein deficiency and Tween 60 in combination increased the rate of absorption of BHA. Excretion of 3H-BHA and/or its metabolites in urine and feces was complete 6.5 days after administration of 2,500 mg/kg 3H-BHA.
mesh_terms: D000818:Animals; D000840:Anisoles / Q000378:metabolism*; D002083:Butylated Hydroxyanisole / Q000008:administration & dosage / Q000378:metabolism*; D004347:Drug Interactions; D005243:Feces / Q000032:analysis; D007408:Intestinal Absorption; D007700:Kinetics; D008297:Male; D008954:Models, Biological; D011136:Polysorbates / Q000494:pharmacology*; D011485:Protein Binding; D011488:Protein Deficiency / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D012709:Serum Albumin / Q000378:metabolism
chemical_list: D000840:Anisoles; D011136:Polysorbates; D012709:Serum Albumin; D002083:Butylated Hydroxyanisole