改进数字四极杆/离子迁移率/轨道阱质谱仪的四极-离子迁移区。

IF 2.7 2区 化学 Q2 BIOCHEMICAL RESEARCH METHODS
Robert L Schrader, Gordon A Anderson, Kacie A Evans, David H Russell
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引用次数: 0

摘要

四极杆/漂移管离子迁移率/Orbitrap仪器需要在四极杆分析区从大气泵送至10-5 Torr,在漂移管泵送至1 Torr,在Orbitrap高真空区泵送至10-5 Torr。Orbitrap高真空区包含转移多极子、c -陷阱和HCD细胞。漂移管和四极杆之间的泵送不足导致四极杆分析室中的氦气,从而影响性能。漂移管与分析室之间额外增加真空区域,使分析压力保持在5.5 × 10-5 Torr以下,漂移管加压至1.5 Torr He。在这种配置下,c反应蛋白(m/z 5000)的单电荷状态被分离出来。在全扫描模式和隔离模式下,用四极杆获得了傅里叶变换离子迁移谱。对漂移管中氦气和氮气的离子光学电压进行了优化,使进入漂移管的离子加热最小。这些仪器的改进提高了离子转移效率,允许通过大型蛋白质复合物的数字四极离子迁移率分离来更好地分离离子,如c反应蛋白的23+和24+电荷状态所示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improving the Quadrupole to Ion Mobility Region in a Digital Quadrupole/Ion Mobility/Orbitrap Mass Spectrometer.

A quadrupole/drift tube ion mobility/Orbitrap instrument requires pumping from atmosphere to 10-5 Torr in the quadrupole analyzer region, back to 1 Torr for the drift tube, and a return to 10-5 Torr for the Orbitrap high vacuum region. The Orbitrap high vacuum region contains the transfer multipole, C-trap, and HCD cell. Insufficient pumping between the drift tube and quadrupole leads to helium in the quadrupole analyzer chamber which compromises performance. Additional vacuum regions were added between the drift tube and the analyzer chamber to maintain the analyzer pressure below 5.5 × 10-5 Torr with the drift tube pressurized to 1.5 Torr of He. In this configuration, the isolation of a single charge state of C-reactive protein (m/z 5,000) was demonstrated. Fourier transform ion mobility spectra were acquired with the quadrupole in full scan mode and in the isolation mode. Ion optic voltages were optimized for both helium and nitrogen bath gases in the drift tube so that minimal ion heating was observed entering the drift tube. These instrument modifications enable improved ion transfer efficiency, allowing for better ion isolation by the digital quadrupole ion mobility separation of large protein complexes, as illustrated by the 23+ and 24+ charge states of C-reactive protein.

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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
257
审稿时长
1 months
期刊介绍: The Journal of the American Society for Mass Spectrometry presents research papers covering all aspects of mass spectrometry, incorporating coverage of fields of scientific inquiry in which mass spectrometry can play a role. Comprehensive in scope, the journal publishes papers on both fundamentals and applications of mass spectrometry. Fundamental subjects include instrumentation principles, design, and demonstration, structures and chemical properties of gas-phase ions, studies of thermodynamic properties, ion spectroscopy, chemical kinetics, mechanisms of ionization, theories of ion fragmentation, cluster ions, and potential energy surfaces. In addition to full papers, the journal offers Communications, Application Notes, and Accounts and Perspectives
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