Determination of Sub-Nanomolar Levels of Low Molecular Mass Thiols in Natural Waters by Liquid Chromatography Tandem Mass Spectrometry after Derivatization with <i>p</i>-(Hydroxymercuri) Benzoate and Online Preconcentration
作者:Van Liem-Nguyen、Sylvain Bouchet、Erik Björn
DOI:10.1021/ac503679y
日期:2015.1.20
ionization tandem mass spectrometry (LC-ESI-MS/MS). Their quantification was performed by selective reaction monitoring (SRM), while the presence of a product ion at m/z 355, specific for thiols and common for the investigated compounds, also allows to screen samples for unknown thiols by a precursor ion scan approach. The robustness of the method was validated for aqueous matrices with different pH,
低分子量(LMM)硫醇是各种各样的化合物,尽管它们通常以低浓度存在,但它们在水生生态系统中起着重要作用。迄今为止,对天然水中LMM硫醇的全面研究受到了先前分析方法的选择性和检测限制的限制。在这里,我们描述了一种选择性和鲁棒性的方法,用于量化天然水中的16种LMM硫醇。硫醇用4-(羟基汞)苯甲酸酯(PHMB)衍生化,并通过固相萃取(SPE)在线预浓缩,然后通过液相色谱分离,并通过电喷雾电离串联质谱法(LC-ESI-MS / MS)测定。通过选择性反应监测(SRM)进行定量,同时在m /z 355对硫醇有特异性,对所研究的化合物通用,z 355还允许通过前体离子扫描方法筛查样品中未知的硫醇。该方法的鲁棒性已针对具有不同pH,硫化物和溶解有机碳(DOC)浓度的水性基质进行了验证。硫醇的检出限在亚纳摩尔范围内(0.06-0.5 nM),该方法可以测定还原的和总的巯基浓度(使用三(2-羧乙基)膦(T