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A flow injection electrospray ionization tandem mass spectrometric method for the simultaneous measurement of trimethylamine and trimethylamine N-oxide in urine

机译:流动注射电喷雾电离串联质谱法同时测定尿液中的三甲胺和三甲胺N-氧化物

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摘要

Key metabolites for the diagnosis of the genetic disorder trimethylaminuria are trimethylamine (TMA) and trimethylamine N-oxide (TMAO). A rapid, automatable flow injection ESI-MS/MS method for their measurement in urine has been developed. The TMA was derivatized with ethyl bromoacetate to form ethyl betaine bromide. The 2 min ESI-MS/MS analysis employed four multiple reaction monitoring (MRM) ion pairs for derivatized TMA (146.1,118.1), derivatized H-2(9)-TMA (155.1,127.1), TMAO (76.1, 58.1) and H-2(9)-TMAO (85.1, 66.1). In control urine samples (n = 27) referred for suspected metabolic problems TMA was 0.11-1.19 mmol/mol creatinine, TMAO was 13.5-181 mmol/mol creatinine and the TMA/TMAO ratio was 0.0025-0.055. In five patients with diagnosed trimethylaminuria, TMA was 5.3-230 mmol/mol creatinine, TMAO was 0.36-607 mmol/mol creatinine and the TMA/TMAO ratio was 0.20-134.
机译:用于诊断遗传病三甲基尿的主要代谢物是三甲胺(TMA)和三甲胺N-氧化物(TMAO)。已经开发了一种快速,自动化的流动注射ESI-MS / MS方法,用于尿液中的测量。用溴乙酸乙酯将TMA衍生化以形成乙基甜菜碱溴化物。 2分钟的ESI-MS / MS分析使用四个多反应监测(MRM)离子对进行衍生化的TMA(146.1,118.1),衍生化的H-2(9)-TMA(155.1,127.1),TMAO(76.1、58.1)和H-2(9)-TMAO(85.1,66.1)。在涉及可疑代谢问题的对照尿液样本(n = 27)中,TMA为0.11-1.19 mmol / mol肌酐,TMAO为13.5-181 mmol / mol肌酐,TMA / TMAO比值为0.0025-0.055。在五例诊断为三甲基尿症的患者中,TMA为5.3-230 mmol / mol肌酐,TMAO为0.36-607 mmol / mol肌酐,TMA / TMAO比值为0.20-134。

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