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Mapping Unsaturation in Human Plasma Lipids by Data-Independent Ozone-Induced Dissociation

  • David L. MarshallEmail author
  • Angela Criscuolo
  • Reuben S. E. Young
  • Berwyck L. J. Poad
  • Martin Zeller
  • Gavin E. Reid
  • Todd W. Mitchell
  • Stephen J. BlanksbyEmail author
Research Article

Abstract

Over 1500 different lipids have been reported in human plasma at the sum composition level. Yet the number of unique lipids present is surely higher, once isomeric contributions from double bond location(s) and fatty acyl regiochemistry are considered. In order to resolve this ambiguity, herein, we describe the incorporation of ozone-induced dissociation (OzID) into data-independent shotgun lipidomics workflows on a high-resolution hybrid quadrupole-Orbitrap platform. In this configuration, [M + Na]+ ions generated by electrospray ionization of a plasma lipid extract were transmitted through the quadrupole in 1 Da segments. Reaction of mass-selected lipid ions with ozone in the octopole collision cell yielded diagnostic ions for each double bond position. The increased ozone concentration in this region significantly improved ozonolysis efficiency compared with prior implementations on linear ion-trap devices. This advancement translates into increased lipidome coverage and improvements in duty cycle for data-independent MS/MS analysis using shotgun workflows. Grouping all precursor ions with a common OzID neutral loss enables straightforward classification of the lipidome by unsaturation position (with respect to the methyl terminus). Two-dimensional maps obtained from this analysis provide a powerful visualization of structurally related lipids and lipid isomer families within plasma. Global profiling of lipid unsaturation in plasma extracts reveals that most unsaturated lipids are present as isomeric mixtures. These new insights provide a unique picture of underlying metabolism that could in the future provide novel indicators of health and disease.

Keywords

Lipidomics Ozone-induced dissociation Data-independent analysis Plasma 

Notes

Acknowledgements

The authors acknowledge generous financial support provided by the Australian Research Council (ARC) through the Discovery Program (DP150101715 and DP190101486), and the EU H2020 funded MASSTRPLAN project (grant number 675132). Some of the data reported here were acquired at the QUT Central Analytical Research Facility (CARF) operated by the Institute for Future Environments.

Supplementary material

13361_2019_2261_MOESM1_ESM.docx (2.9 mb)
ESM 1 (DOCX 2991 kb)

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© American Society for Mass Spectrometry 2019

Authors and Affiliations

  1. 1.Central Analytical Research Facility, Institute for Future EnvironmentsQueensland University of TechnologyBrisbaneAustralia
  2. 2.Institute of Bioanalytical Chemistry, Faculty of Chemistry and MineralogyUniversität LeipzigLeipzigGermany
  3. 3.Center for Biotechnology and BiomedicineUniversität LeipzigLeipzigGermany
  4. 4.Thermo Fisher Scientific (Bremen) GmbHBremenGermany
  5. 5.School of Chemistry, Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneAustralia
  6. 6.School of Chemistry, Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology InstituteThe University of MelbourneParkvilleAustralia
  7. 7.School of Medicine and Molecular HorizonsUniversity of WollongongWollongongAustralia
  8. 8.Illawarra Health and Medical Research InstituteWollongongAustralia

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