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• W2102994511 abstract "A sensitive gas chromatography/mass spectrometry (GC/MS) method was developed to measure nitrosamine–haemoglobin adducts (HPB-Hb) (4-hydroxy-3-pyridinyl-1-butanone) at trace levels in red blood cells of smoking and non-smoking mothers and their newborn babies. GC/MS methods with chemical ionization (CI) of methane reagent gas in both positive and negative ion mode as well as electron ionization (EI) were studied to determine differences in sensitivity among the various ionization methods. Detection limits using both positive and negative chemical ionization modes were found to be 30 fmol HPB, whereas detection using electron impact modes yielded a detection limit of 80 fmol HBP. In order to apply the various methods of detection to tobacco-exposed samples from human populations, we characterized adduct levels in maternal as well as paired fetal samples obtained from mothers exposed to tobacco smoke during pregnancy. Maternal samples were characterized using serum cotinine levels and were classified as non-smokers, passively smoke-exposed women, less than one pack per day smokers and greater than one pack per day smokers. Paired maternal and fetal blood samples were obtained at delivery for qualitative and qualitative analysis of nitrosamine adducts. Comparative derivatization of HPB released under alkaline hydrolysis conditions was performed using O-bis(trimethylsilyl)-trifluoroacetamide (BSTFA) and 2,3,4,5,6-pentafluorobenzoylchloride (PFBC). Both negative CI and positive CI modes of analysis were compared to the more widely accepted EI modes of mass spectrometric analysis. These results suggest that both NICI and PICI modes of detection offer a greater sensitivity of adduct characterization when compared with EI ionization techniques and that either NICI or PICI modes are preferably applicable towards the detection of human biomarker assessment of tobacco-related nitrosamines." @default.
• W2102994511 created "2016-06-24" @default.
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• W2102994511 date "2008-01-01" @default.
• W2102994511 modified "2023-09-26" @default.
• W2102994511 title "Haemoglobin adducts as biomarkers of exposure to tobacco-related nitrosamines" @default.
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• W2102994511 doi "https://doi.org/10.1080/13547500701470561" @default.
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