MAJOR URINARY METABOLITES IN HAMSTERS AND RATS TREATED WITH N-NITROSO(2-HYDROXYPROPYL)(2-OXOPROPYL)AMINE

  • 1 January 1985
    • journal article
    • research article
    • Vol. 45  (8) , 3586-3592
Abstract
Rats and hamsters were administered a single dose of N-[1-14C]nitroso(2-hydroxypropyl)(2-oxopropyl)amine (HPOP), and their urinary metabolites were examined at various time intervals. In both species, urinary excretion of radiolabeled metabolites reached a plateau at 6 h following injection. At this time, 35 and 28% of the total dose was found in the urine of rats and hamsters, respectively. Separation by liquid chromatography and subsequent characterization by NMR, gas chromatography-mass spectroscopy, and IR showed that the major metabolites in rat urine were HPOP, N-nitrosobis(2-hydroxypropyl)amine (BHP), and their glucuronic acid conjugates. The conjugates accounted for 30 and 9%, while free HPOP and BHP accounted for 42 and 16% of the total metabolites, respectively. Hamster urine contained free HPOP, BHP, their glucuronic acid conjugates, and a sulfate ester of HPOP not found in rat urine. Six h following administration of HPOP, hamster urine contained BHP, BHP glucuronide, HPOP, HPOP glucuronide, and HPOP sulfate ester at levels of 35, 9, 16, 9 and 14%, respectively. Apparently, hamsters reduce HPOP to BHP more efficiently than rats, while rats are more effective in forming their glucuronic acid conjugates. Hamsters differ significantly from rats in their capacity to form and excrete the sulfate ester of HPOP.

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