title: Investigation of drift gas selectivity in high resolution ion mobility spectrometry with mass spectrometry detection.
abstract: Recent studies in electrospray ionization (ESI)/ion mobility spectrometry (IMS) have focussed on employing different drift gases to alter separation efficiency for some molecules. This study investigates four structurally similar classes of molecules (cocaine and metabolites, amphetamines, benzodiazepines, and small peptides) to determine the effect of structure on relative mobility changes in four drift gases (helium, nitrogen, argon, carbon dioxide). Collision cross sections were plotted against drift gas polarizability and a linear relationship was found for the nineteen compounds evaluated in the study. Based on the reduced mobility database, all nineteen compounds could be separated in one of the four drift gases, however, the drift gas that provided optimal separation was specific for the two compounds.
authors.affiliation: Department of Chemistry, Washington State University, Pullman 99164-4630, USA.
authors.forename: Laura M
authors.initials: LM
authors.lastname: Matz
authors.forename: Herbert H
authors.initials: HH
authors.lastname: Hill
authors.forename: Luther W
authors.initials: LW
authors.lastname: Beegle
authors.forename: Isik
authors.initials: I
authors.lastname: Kanik
mesh_terms: D000465:Algorithms; D000662:Amphetamines / Q000737:chemistry; D003042:Cocaine / Q000737:chemistry; D005740:Gases / Q000737:chemistry*; D007202:Indicators and Reagents; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry; D012044:Regression Analysis; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation*
chemical_list: D000662:Amphetamines; D005740:Gases; D007202:Indicators and Reagents; D010455:Peptides; D003042:Cocaine