title: Integrating ion mobility spectrometry into mass spectrometry-based exposome measurements: what can it add and how far can it go?
abstract: Measuring the exposome remains a challenge due to the range and number of anthropogenic molecules that are encountered in our daily lives, as well as the complex systemic responses to these exposures. One option for improving the coverage, dynamic range and throughput of measurements is to incorporate ion mobility spectrometry (IMS) into current MS-based analytical methods. The implementation of IMS in exposomics studies will lead to more frequent observations of previously undetected chemicals and metabolites. LC-IMS-MS will provide increased overall measurement dynamic range, resulting in detections of lower abundance molecules. Alternatively, the throughput of IMS-MS alone will provide the opportunity to analyze many thousands of longitudinal samples over lifetimes of exposure, capturing evidence of transitory accumulations of chemicals or metabolites. The volume of data corresponding to these new chemical observations will almost certainly outpace the generation of reference data to enable their confident identification. In this perspective, we briefly review the state-of-the-art in measuring the exposome, and discuss the potential use for IMS-MS and the physico-chemical property of collisional cross section in both exposure assessment and molecular identification.
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
authors.forename: Thomas O
authors.initials: TO
authors.lastname: Metz
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
authors.forename: Erin S
authors.initials: ES
authors.lastname: Baker
authors.affiliation: Eawag, Swiss Federal Institute of Aquatic Science & Technology, Dübendorf, Switzerland.
authors.forename: Emma L
authors.initials: EL
authors.lastname: Schymanski
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
authors.forename: Ryan S
authors.initials: RS
authors.lastname: Renslow
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
authors.forename: Dennis G
authors.initials: DG
authors.lastname: Thomas
authors.affiliation: Division of Analytical Chemistry, Department of Chemistry, University of Natural Resources & Life Sciences (BOKU Vienna), Vienna, Austria.
authors.forename: Tim J
authors.initials: TJ
authors.lastname: Causon
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
authors.forename: Ian K
authors.initials: IK
authors.lastname: Webb
authors.affiliation: Division of Analytical Chemistry, Department of Chemistry, University of Natural Resources & Life Sciences (BOKU Vienna), Vienna, Austria.
authors.forename: Stephan
authors.initials: S
authors.lastname: Hann
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Smith
authors.affiliation: Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA.|Department of Environmental & Molecular Toxicology, Oregon State University, Corvallis, OR, USA.
authors.forename: Justin G
authors.initials: JG
authors.lastname: Teeguarden
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods; D019295:Computational Biology / Q000379:methods*; D057166:High-Throughput Screening Assays / Q000379:methods; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods*; D055442:Metabolome; D057188:Workflow
keywords: collision cross section; exposome; ion mobility spectrometry; mass spectrometry; metabolome