Journal
ANALYST
Volume 143, Issue 7, Pages 1556-1559Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8an00056e
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Funding
- Center for Innovative Technology at Vanderbilt University
- Agilent Technologies
- National Institutes of Health (NIH NIGMS) [R01GM099218]
- U. S. Environmental Protection Agency [83573601]
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The field of ion mobility-based omics studies requires high-quality collision cross section (CCS) libraries to effectively utilize CCS as a molecular descriptor. Absolute CCS values with the highest precision are obtained on drift tube instruments by measuring the drift time of ions at multiple drift voltages, commonly referred to as a stepped field' experiment. However, generating large scale absolute CCS libraries from drift tube instruments is time consuming due to the current lack of high-throughput methods. This communication reports a fully automated stepped-field method to acquire absolute CCS on commercially available equipment. Using a drift tube ion mobility-mass spectrometer (DTIM-MS) coupled to a minimally modified liquid chromatography (LC) system, CCS values can be measured online with a carefully timed flow injection analysis (FIA) experiment. Results demonstrate that the FIA stepped-field method yields CCS values which are of high analytical precision (<0.4% relative standard deviation, RSD) and accuracy (0.4% difference) comparable to CCS values obtained using traditional direct-infusion stepped-field experiments. This high-throughput CCS method consumes very little sample volume (20 L) and will expedite the generation of large-scale CCS libraries to support molecular identification within global untargeted studies.
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