title: Comparative metabolism and urinary excretion of N-mononitrosopiperazine and N,N'-dinitrosopiperazine in the rat.
abstract: The metabolism of N-mononitrosopiperazine (NPz) and N,N'-dinitrosopiperazine (DNPz) was investigated in Sprague-Dawley rats. When an oral dose of 50 micrograms/rat NPz was administered, 10.5% of the dose was recovered unchanged in urine together with N-nitroso-3-hydroxypyrrolidine (NHPYR, 1.3% of administered NPz dose) and N-nitrosodiethanolamine (NDELA, 0.3%). For DNPz, 7.7% of the administered dose together with NPz (0.04%), NHPYR (2.9%), NDELA (6.7%) and N-nitroso(2-hydroxyethyl)glycine (NHEG, 20.2%) was recovered in urine after 24 h. These results show extensive metabolism of both NPz and DNPz and suggest that both NPz and NHPYR could be analysed in urine as markers for the endogenous nitrosation of piperazine in patients receiving antihelminthic treatment with piperazine.
authors.affiliation: Institute of Toxicology and Chemotherapy, German Cancer Research Center, Heidelberg.
authors.forename: A R
authors.initials: AR
authors.lastname: Tricker
authors.forename: T
authors.initials: T
authors.lastname: Kälble
authors.forename: R
authors.initials: R
authors.lastname: Preussmann
mesh_terms: D000818:Animals; D002273:Carcinogens / Q000378:metabolism*; D002849:Chromatography, Gas; D004052:Diethylnitrosamine / Q000032:analysis / Q000031:analogs & derivatives; D008297:Male; D009242:N-Nitrosopyrrolidine / Q000031:analogs & derivatives / Q000032:analysis; D009602:Nitrosamines / Q000378:metabolism* / Q000652:urine; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002273:Carcinogens; D009602:Nitrosamines; C014129:N-nitrosodiethanolamine; D004052:Diethylnitrosamine; C013565:3-hydroxy-1-nitrosopyrrolidine; C038290:N-(2-hydroxyethyl)-N-carboxymethylnitrosamine; C026156:N,N'-dinitrosopiperazine; C014711:1-nitrosopiperazine; D009242:N-Nitrosopyrrolidine