title: Clearance and excretion of intratracheally and orally administered aflatoxin B1 in the rat.
abstract: The pharmacokinetic disposition of intratracheally (i/t) and orally administered [3H]AFB1 was studied in male Sprague-Dawley rats. Blood, urine and faeces were collected at selected intervals following administration of a single i/t or oral dose of AFB1 (600 micrograms/kg) in saline. Blood-concentration data from both groups approximated a two-compartment open model. The time-to-peak for the i/t group (hr) was less than that for the oral group (3 hr), but the disappearance of label from the blood followed a nearly identical course in both groups. The plasma half-lives (t1/2) were 87.7 and 91.8 hr for the i/t and oral groups, respectively. In addition, urinary and faecal excretion profiles were similar. By day 23, urinary excretion of label had accounted for 16.4 and 15.0% of the dose in the i/t and oral groups, respectively, and faecal excretion for 56.0 and 54.6%. At this time, however, significantly more label was recovered from the lungs and upper airways of the rats of the i/t group than in those treated orally.
mesh_terms: D000042:Absorption; D000284:Administration, Oral; D016604:Aflatoxin B1; D000348:Aflatoxins / Q000097:blood / Q000378:metabolism* / Q000652:urine; D000818:Animals; D005243:Feces / Q000032:analysis; D006207:Half-Life; D007442:Intubation, Intratracheal; D007700:Kinetics; D008099:Liver / Q000378:metabolism; D008168:Lung / Q000378:metabolism; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000348:Aflatoxins; D016604:Aflatoxin B1