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|Title:||A sensitive liquid chromatographic method for the spectrophotometric determination of urinary trans,trans-muconic acid|
Interference of sorbic acid
Low level benzene exposure
|Citation:||Lee, B.L., Ong, H.Y., Ong, Y.B., Ong, C.N. (2005). A sensitive liquid chromatographic method for the spectrophotometric determination of urinary trans,trans-muconic acid. Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences 818 (2) : 277-283. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jchromb.2005.01.009|
|Abstract:||Benzene is a human carcinogen and its metabolite, urinary trans,trans-muconic acid (ttMA), is a biomarker for risk assessment. However, most of the existing methods were not sensitive enough for monitoring of low level exposure. This paper describes a HPLC-UV method for ttMA determination with enhanced selectivity and sensitivity. A 30 mg Oasis®MAX cartridge was used to clean-up 50 μl of urine sample and gradient elution was performed on a Zorbax SB-C18 column (30°C). ttMA was detected at wavelength 263 nm using a UV diode array detector (DAD). The two mobile phases used were (A) 150 mM ortho-phosphoric acid containing of 9% (v/v) methanol; and (B) 125 mM ortho-phosphoric acid containing 30% (v/v) acetonitrile. The method was validated with 61 urine samples collected from non-occupationally benzene exposed individuals and 14 quality control specimens from an international quality assessment scheme. The urinary ttMA concentrations (mean ± S.D. μg/g creatinine) were 90 ± 34 for smokers (n =26), 49 ± 39 for non-smokers (n = 21) and 23 ± 18 for non-smoking hospital staff (n = 14). A correlation coefficient, r = 0.99 was found with 14 external quality specimens for ttMA ranged from 0.4 to 6.8 mg/l. The recovery and reproducibility were generally over 90% and the detection limit was 5 μg/l. © 2004 Elsevier B.V. All rights reserved.|
|Source Title:||Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences|
|Appears in Collections:||Staff Publications|
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