2D MS/MS Spectra Recorded in the Time Domain Using Repetitive Frequency Sweeps in Linear Quadrupole Ion Traps
2D MS/MS Spectra Recorded in the Time Domain Using Repetitive Frequency Sweeps in Linear Quadrupole Ion Traps
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DOI：
10.1021/acs.analchem.0c01719
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发表时间：
2020-07-21
影响因子：
7.4
通讯作者：
Cooks, R. Graham
中科院分区：
文献类型：
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作者：
Szalwinski, Lucas J.;Holden, Dylan T.;Cooks, R. Graham
由于与环境电离方法的兼容性和串联质谱学(MS/MS)的现成实现，尽管质量分辨率有限，离子陷阱质谱计已经成为强大的现场分析平台。当工作在恒定的捕获电压下时，离子可以在其长期频率上被激活，并且可以进行所有的MS/MS实验，包括二维串联质量扫描(2D MS/MS扫描)，其中所有的前体离子及其后续产物离子都被识别和关联。在这里提出的进行这种2D MS/MS实验的新方法中，前驱体离子由非线性(逆Mathieu q)频率扫描激发，而所产生的产物离子通过重复的正交非线性(逆Mathieu q)频率扫描中的喷射时间来识别。由此产生的紧凑表示包含一组电离化合物的总碎裂行为，并有效地捕获详细的化学信息(通常在1 S中)。该方法是用一个简单的单质量分析仪实现的。这一方法在三种不同的多组分混合物上进行了测试：滥用药物、多肽和芬太尼类似物。将这些数据与更常见的MS/MS扫描方法获得的数据进行了比较。
Ion trap mass spectrometers have emerged as powerful on-site analytical platforms, in spite of limited mass resolution, due to their compatibility with ambient ionization methods and ready implementation of tandem mass spectrometry (MS/MS). When operated at constant trapping voltage, ions can be activated at their secular frequencies and all MS/MS experiments can be performed, including the two-dimensional tandem mass scan (2D MS/MS scan) in which all precursor ions and their subsequent product ions are both identified and correlated. In the new method of performing this 2D MS/MS experiment presented here, the precursor ions are excited by a nonlinear (inverse Mathieu q) frequency sweep while the resulting product ions are identified by their ejection time within a repeating orthogonally applied nonlinear (inverse Mathieu q) frequency sweep. This resulting compact representation contains the total fragmentation behavior of a collection of ionized compounds and captures detailed chemical information efficiently (typically in 1 s). The approach is implemented using a simple single mass analyzer instrument. This methodology was tested on three different multicomponent mixtures: drugs of abuse, peptides, and fentanyl analogs. The data are compared with those obtained by more common MS/MS scan methods.