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http://ntour.ntou.edu.tw:8080/ir/handle/987654321/34171
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| Title: | Determination of urine melamine by validated isotopic ultra-performance liquid chromatography/tandem mass spectrometry |
| Authors: | Wei-Chih Cheng;Shu-Kong Chen;Tien-Jen Lin;I-Jen Wang;Ya-Min Kao;Daniel Yang-Chih Shih |
| Contributors: | NTOU:Department of Food Science
國立臺灣海洋大學:食品科學系 |
| Date: | 2009-06-30
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| Issue Date: | 2013-10-07T02:03:44Z
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| Publisher: | Rapid Communications in Mass Spectrometry |
| Abstract: | Abstract:Little is known about melamine (MEL) analysis in children's urine. In this study, an isotopic ultra-performance liquid chromatography/tandem mass spectrometry (UPLC/MS/MS) method was developed and systematically validated for the analysis of MEL in urine. The method is easily performed and comprises acidification, solid-phase extraction (SPE) and UPLC/MS/MS analysis. (13)C(3)N(3)((15)NH(2))(3) was used as the internal standard (IS) for calibration. Transition ions m/z 127 > 85 of MEL and m/z 133 > 89 of the IS were used for quantification and m/z 127 > 68 of MEL was used for quantitative confirmation. Recovery and precision were assessed to guarantee the applicability of the method. The limit of quantification (LOQ) was 0.01 microg/mL while the calculated method detection limit was 0.006 microg/mL. The mean recoveries ranged from 96-99%. The method was then applied to analyze urine samples from children who had potentially consumed MEL-tainted dairy products during screening in Taiwan. Ten nephrolithiasis cases and 20 age- and gender-matched controls were selected for this study. Three out of the 10 nephrolithiasis cases had elevated levels of MEL. Comparatively, twenty age- and gender-matched non-nephrolithiasis controls consuming Taiwan brand milk powder all showed MEL levels lower than the detection limit except for two children with background levels of 0.02 microg/mL. The background level in these children urine samples was established by UPLC/MS/MS analysis. Positive results of urine MEL tests might be associated with nephrolithiasis in these candidates. Measurement of urine MEL concentration can be helpful in confirming MEL-related nephrolithiasis, but its clinical application needs further clarification. |
| Relation: | 23(12), pp.1776-1782 |
| URI: | http://ntour.ntou.edu.tw/handle/987654321/34171 |
| Appears in Collections: | [食品科學系] 期刊論文
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