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A Study on Formation of Hemoglobin Adduct in Blood of Mice Inhaled with Ethylene Oxide  

Lee Jin-Heon (Department of Environmental Education, Kongju National University)
Shin Ho-Sang (Department of Environmental Education, Kongju National University)
Ahn Hye-Sil (Department of Environmental Education, Kongju National University)
Publication Information
Journal of Environmental Health Sciences / v.32, no.2, 2006 , pp. 164-170 More about this Journal
Abstract
Ethylene oxide is a genotoxic carcinogen with widespread uses as industrial chemical intermediate and gaseous sterilant. 2-hydroxyethylated N-terminal valine in Hb is a good biomarker for biological monitoring of ethylene oxide exposure, because of its stability. For measuring the hemoglobin adduct formed by exposure of ethylene oxide, we studied the determination of (N-2-hydroxy-ethyl)valine(HEV) in hemoglobin adduct by using GC/MS. Firstly we synthesized HEV with 2-amino-ethanol and bromoisovaleric acid(BIVA) and confirmed it with GC/MS-FID. Its fragmentations were m/z 116(base ion, M+-45) and m/z 130(M+-31). For measuring HEV with higher sensitivity, we use derivatives which were PFPITH(pentafluorophenylisothiocianate) and TBDMS (tributyldimethylsilylation) by using Edman procedure. Its fragmentation were m/z 425(M+-57), m/z 383(M+-99) and m/z 172(M+-310) by using GC/MS. We did biological monitoring for mice inhalation exposure with 400 ppm ethylene oxide. The concentrations of hemoglobin adduct were $168{\pm}3.8\;and\;512{\pm}04$(nmol g-1 globin) at 0.5 hr/day 400 ppm ethylene oxide inhalation exposure group, and $631{\pm}17\;and\;2265{\pm}9.4$(nmol g-1 globin) at 1.0 hr/day 400 ppm ethylene oxide inhalation exposure for 1 and 4 weeks, respectively. We confirmed that (N-2-hydroxy-ethyl)valine(HEV) of hemoglobin was a good biomarker for biomonitoring of ethylene oxide exposure, and can measured with derivatives such as PFPITH(pentafluorophenylisothiocianate) and TBDMS(tributyldimethylsilylation) by using GC/MS.
Keywords
ethylene oxide; (N-2-hydroxy-ethyl)valine(HEV); hemoglobin adduct; GC/MS;
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