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dc.contributor.authorShvartsburg, Alexandre A.
dc.contributor.authorHaris, Anisha
dc.contributor.authorAndrzejewski, Roch
dc.contributor.authorEntwistle, Andrew
dc.contributor.authorGiles, Roger
dc.identifier.citationAlexandre A. Shvartsburg, Anisha Haris, Roch Andrzejewski, Andrew Entwistle, and Roger Giles. Differential Ion Mobility Separations in the Low-Pressure Regime. Analytical Chemistry 2018 90 (1), 936-943en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractIon mobility spectrometry (IMS) in conjunction with mass spectrometry (MS) has emerged as a powerful platform for biological and environmental analyses. An inherent advantage of differential or field asymmetric waveform IMS (FAINTS) based on the derivative of mobility vs electric field over linear IMS based on absolute mobility is much greater orthogonality to MS. Effective coupling of linear IMS to MS and diverse IMS/MS arrangements and modalities impossible at ambient buffer gas pressure were enabled at much reduced pressures. In contrast, FAIMS devices operate at or near atmospheric pressure, which complicated integration with MS. Here, we show PALMS at similar to 1.5-30 Torr using a planar-gap stage within the MS instrument envelope. Fields up to similar to 300 Td permitted by the Paschen law at these pressures greatly raise the separation speed, providing fair resolution in similar to 10 ms and FAIMS scans in under 5 s. Rapid separation and efficient ion collection at low pressure minimize losses in the FAIMS step. Separations for key analyte classes and their dependences on electric field mirror those at ambient pressure. The potential for proteomics is demonstrated by separations of isomeric peptides with variant localization of post-translational modifications.en_US
dc.description.sponsorshipNSF CAREER Award (CHE-1552640).en_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofseriesAnalytical Chemistry;v.90:no.1
dc.subjectElectron-transfer dissociationen_US
dc.subjectPosttranslational modificationsen_US
dc.subjectCluster ionsen_US
dc.titleDifferential ion mobility separations in the low-pressure regimeen_US
dc.rights.holderCopyright © 2017 American Chemical Societyen_US

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