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The influence of electrospray ion source design on matrix effects

机译:电喷雾离子源设计对基质效应的影响

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This study investigates to which extent the design of electrospray ion sources influences the susceptibility to matrix effects (MEs) in liquid chromatography-tandem mass spectrometry (LC-MS/MS). For this purpose, MEs were measured under comparable conditions (identical sample extracts, identical LC column, same chromatographic method and always positive ion mode) on four LC-MS/MS instrument platforms. The instruments were combined with five electrospray ion sources, viz. Turbo Ion Spray, Turbo V TM Source, Standard ESI, Jet Stream ESI and Standard Z-Spray Source. The comparison of MEs could be made at all retention times because the method of permanent postcolumn infusion was applied. The MEs ascertained for 45 pesticides showed for each electrospray ion source the same pattern, i.e. the same number of characteristic signal suppressions at equivalent retention times in the chromatogram. The Turbo Ion Spray (off-axis geometry), Turbo V ~(TM) Source (orthogonal geometry) and the Standard Z-Spray Source (double orthogonal geometry) did not differ much in their susceptibility to MEs. The Jet Stream ESI (orthogonal geometry) reaches a higher sensitivity by an additional heated sheath gas, but suffers at the same time from significantly stronger signal suppressions than the comparable Standard ESI (orthogonal geometry) without sheath gas. No relation between source geometry and extent of signal suppression was found in this study.
机译:这项研究调查了电喷雾离子源的设计在何种程度上影响了液相色谱-串联质谱法(LC-MS / MS)对基质效应(ME)的敏感性。为此,在四个LC-MS / MS仪器平台上,在相当的条件下(相同的样品提取物,相同的LC色谱柱,相同的色谱方法以及始终为阳离子模式)对ME进行了测量。仪器与五个电喷雾离子源结合使用。 Turbo离子喷雾,Turbo V TM离子源,标准ESI,喷射流ESI和标准Z喷雾源。由于采用了柱后永久输注的方法,因此可以在所有保留时间进行ME的比较。对于每种电喷雾离子源,针对45种农药确定的ME均显示相同的模式,即在色谱图中相等的保留时间具有相同数量的特征信号抑制。 Turbo离子喷雾(离轴几何形状),Turbo V〜(TM)源(正交几何形状)和标准Z喷雾源(双正交几何形状)在对ME的敏感性方面差别不大。喷射流ESI(正交几何形状)通过附加加热的鞘气达到了更高的灵敏度,但同时比没有鞘气的标准ESI(正交几何形状)具有明显更强的信号抑制能力。在这项研究中没有发现源的几何形状和信号抑制程度之间的关系。

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