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首页> 外文期刊>Journal of mass spectrometry: JMS >Secondary processes in atmospheric pressure chemical ionization-ion trap mass spectrometry: a case study of orotic acid
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Secondary processes in atmospheric pressure chemical ionization-ion trap mass spectrometry: a case study of orotic acid

机译：大气压化学电离-离子阱质谱中的次级过程：以牛磺酸为例

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摘要

Atmospheric pressure chemical ionization is known for producing unusual artifacts of the ionization process in some cases. In this work, processes occuring in atmospheric pressure chemical ionization/MS of orotic acid that afforded ions accompanying protonated and deprotonated orotic acid molecules in the spectra were studied. Two processes ran in parallel in the ion source: decarboxylation of neutral orotic acid and collision-induced dissociation of its protonated or deprotonated form. A procedure discerning pre-ionization decomposition and post-ionization dissociation by manipulating ion source parameters was proposed. Experiments with isotopically labeled solvents confirmed ion-molecule reactions of the product of collision-induced dissociation of protonated orotic acid with solvent molecules in the ion source and even under vacuum in the ion trap.
机译：众所周知，大气压化学电离在某些情况下会产生电离过程的异常伪像。在这项工作中，研究了在大气压下发生的乳清酸化学电离/ MS过程，该过程在光谱中提供了伴随质子化和去质子化的乳清酸分子的离子。离子源中有两个并行运行的过程：中性乳清酸的脱羧和质子化或去质子化形式的碰撞诱导解离。提出了一种通过控制离子源参数识别电离前分解和电离后解离的程序。用同位素标记的溶剂进行的实验证实了碰撞诱导的质子化乳清酸离解产物与离子源中的溶剂分子甚至在离子阱中处于真空下的离子分子反应。

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