title: Trans-3'-hydroxycotinine as a main metabolite in urine of smokers.
abstract: Nine male smokers smoked three types of cigarettes that differed in mainstream nicotine. The experiment was carried out in three runs, each consisting of 7 d when smoking was allowed and 5 d when it was not allowed. Urine fractions were collected throughout the whole period of the experiments. As assumed, nicotine and four of its known metabolites, i.e., cotinine, nicotine-N'-oxide, nornicotine, and N-methyl-nicotinum ions were found in the urine. In addition, trans-3'-hydroxycotinine was determined. The amount of this metabolite was well in excess of those of nicotine and cotinine in the urine. The serum concentration trans-3'-hydroxycotinine was found to be second to serum cotinine.
mesh_terms: D003367:Cotinine / Q000031:analogs & derivatives / Q000652:urine*; D006801:Humans; D008297:Male; D009538:Nicotine / Q000378:metabolism / Q000652:urine; D011760:Pyrrolidinones / Q000652:urine*; D012907:Smoking
chemical_list: D011760:Pyrrolidinones; C001381:hydroxycotinine; D009538:Nicotine; D003367:Cotinine