title: Kinetics and bioavailability of N-nitrosodiethanolamine after intravenous and cutaneous administration to rats.
abstract: Male CD-COBS rats were given N-nitrosodiethanolamine (NDELA) by intravenous or cutaneous administration at a dose of 5 mg/kg. Blood and liver were analysed for NDELA at various times after administration. The excretion of unchanged NDELA and its acidic metabolite N-(2-hydroxyethyl)-N-carboxymethylnitrosamine (ECMN) was determined in urine for 24 hr after treatment. The semilogarithmic blood concentration-time plot after iv injection showed a triphasic profile indicating that a three-compartment model may adequately describe the kinetics of this compound. After cutaneous application NDELA was rapidly absorbed through the skin, and the absolute bioavailability was calculated to be 27% from blood data, and to be 32% (NDELA + ECMN) from urine data. Hepatic NDELA levels reflected blood levels after both treatments, indicating that this organ does not accumulate NDELA to a significant extent. Urinary excretion of unchanged NDELA after iv and cutaneous administration was 83 and 25% of the administered dose, respectively. ECMN excretion was 4.9 and 2.5% of the administered dose after iv and cutaneous administration, respectively.
mesh_terms: D000818:Animals; D001682:Biological Availability; D002849:Chromatography, Gas; D004052:Diethylnitrosamine / Q000008:administration & dosage* / Q000031:analogs & derivatives / Q000378:metabolism; D007275:Injections, Intravenous; D007700:Kinetics; D008099:Liver / Q000378:metabolism; D008297:Male; D008954:Models, Biological; D009602:Nitrosamines / Q000008:administration & dosage*; D051381:Rats; D012869:Skin Absorption
chemical_list: D009602:Nitrosamines; C014129:N-nitrosodiethanolamine; D004052:Diethylnitrosamine