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首页> 外文期刊>Journal of mass spectrometry: JMS >Ion trap MS using high trapping gas pressure enables unequivocal structural analysis of three isobaric compounds in a mixture by using energy-resolved mass spectrometry and the survival yield technique
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Ion trap MS using high trapping gas pressure enables unequivocal structural analysis of three isobaric compounds in a mixture by using energy-resolved mass spectrometry and the survival yield technique

机译：使用高捕获气体压力的离子阱MS通过使用能量分辨的质谱和存活率技术来实现混合物中三种异除化合物的明确结构分析

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摘要

Recently, it has been shown that energy-resolved mass spectrometry (MS) can provide quantitative information from two isomeric or isobaric compounds in mixtures by using the survival yield (SY) technique together with "gas-phase collisional purification" (GPCP) strategy (Anal. Chem., 2016, 88, p.10821). Herein, we present an improvement and an extension of this concept to the structural analysis of a model mixture of three isobaric compounds (two peptides and a polyether). By using default collision-induced dissociation (CID) tandem MS parameters on an ion trap instrument, the previous approach did not show any signs of isobaric contamination. However, by modifying CID conditions and using a threefold increase of the He trapping gas pressure (to reach 3.00 center dot 10(-5) mbar), the SY curve was unexpectedly and strongly shifted to higher excitation voltages with two plateaus appearing. Those plateaus, indicating clearly the presence of three isobaric compounds, were taken as reliable indicators to perform GPCP at carefully selected excitation voltages in order to selectively fragment one compound after the other. In this way, CID mass spectra of each compound were correctly recovered, both in terms of fragment ion peaks and in terms of relative intensities, from energy-resolved MSn spectra of the three compounds mixture. This feature enables their unequivocal structural analysis as if samples were free from isobaric interferences. In this paper, we also discuss the possibility for recovering SY curves for pure compounds directly from the mixture. Clearly, in this case, the higher He trapping gas pressure made it possible to use the SY technique, for the first time, for the structural analysis in the case of mixtures of three isobaric compounds. This observation, quite unexpected, demonstrates that the trapping gas pressure is of paramount importance although it is usually not considered in energy-resolved MS for structural and/or quantitative analysis.
机译：最近，已经表明，通过使用生存产率（SY）技术与“气相碰撞纯化”（GPCP）策略一起（肛门。化学。，2016,88，p.10821）。在此，我们提高了这种概念的改进和延伸，以对三种异戊二醇化合物的模型混合物（两种肽和聚醚）的结构分析。通过使用离子陷阱仪器上的默认冲突诱导的解离（CID）串联MS参数，前面的方法没有显示出异卵污染的任何迹象。然而，通过修改CID条件并使用捕获气体压力的三倍增加（达到3.00中心点10（-5）曼巴），出乎意料地曲线并强烈地移动到具有两个平台的更高激励电压。这些强韧性，表明存在三种等异物化合物的存在，作为可靠的指示剂，以在仔细选择的激发电压下进行GPCP，以便在另一个化合物之后选择一个化合物。以这种方式，根据片段离子峰和相对强度来正确地回收各种化合物的CID质谱，从三种化合物混合物的能量分辨MSN光谱。此功能使其明确的结构分析，仿佛样品不含异除的干扰。在本文中，我们还讨论了直接从混合物中回收纯化合物的SY曲线的可能性。清楚地，在这种情况下，他捕获气体的较高使得能够首次使用SY技术，以便在三种同学化合物的混合物的情况下进行结构分析。这种观察结果非常出乎意料，表明捕获气体压力至关重要，尽管通常不考虑在能量分辨的MS中，用于结构和/或定量分析。

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