title: Non-mutagenicity of urine from coffee drinkers compared with that from cigarette smokers.
abstract: The urine of human coffee drinkers who ingested 12 g of instant coffee per day, during 4 days in a first experiment or 12 g within 2 h in a second experiment, was fractionated by XAD-2 column chromatography. The non-polar urine fractions so obtained were not mutagenic in the Ames Salmonella tester strains TA98 or TA100 in either experiment, either with or without beta-glucuronidase treatment of the urine. The non-polar urine fraction of smokers, who smoked 20--30 cigarettes per day during 4 days in the first experiment or 7--18 cigarettes during 7 h in the second experiment, was mutagenic when metabolically activated.
mesh_terms: D000328:Adult; D000818:Animals; D001711:Biotransformation; D003069:Coffee / Q000009:adverse effects*; D005260:Female; D005966:Glucuronidase / Q000378:metabolism; D006801:Humans; D008297:Male; D008862:Microsomes, Liver / Q000378:metabolism; D009152:Mutagenicity Tests; D009153:Mutagens; D051381:Rats; D012486:Salmonella typhimurium / Q000187:drug effects; D012907:Smoking; D014556:Urine
chemical_list: D003069:Coffee; D009153:Mutagens; D005966:Glucuronidase