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Analytical and Bioanalytical Chemistry

, Volume 407, Issue 17, pp 5053–5064 | Cite as

Combining liquid chromatography with ozone-induced dissociation for the separation and identification of phosphatidylcholine double bond isomers

  • Rachel L. Kozlowski
  • J. Larry Campbell
  • Todd W. MitchellEmail author
  • Stephen J. BlanksbyEmail author
Research Paper
Part of the following topical collections:
  1. Lipidomics

Abstract

Revealing the inherent molecular diversity of lipid biology requires advanced analytical technologies. Distinguishing phospholipids that differ in the position(s) of carbon-carbon double bonds within their acyl chains presents a particular challenge because of their similar chromatographic and mass spectral behaviours. Here—for the first time—we combine reversed-phase liquid chromatography for separation of isomeric phospholipids with on-line mass spectral analysis by ozone-induced dissociation (OzID) for unambiguous double bond position assignment. The customised tandem linear ion-trap mass spectrometer used in our study is capable of acquiring OzID scans on a chromatographic timescale. Resolving the contributions of isomeric lipids that are indistinguishable based on conventional mass spectral analysis is achieved using the combination of liquid chromatography and OzID. Application of this method to the analysis of simple (egg yolk) and more complex (sheep brain) extracts reveals significant populations of the phosphatidylcholine PC 16:0_18:1(n−7) alongside the expected PC 16:0_18:1(n−9) isomer.

Graphical Abstract

Separation and identification double bond positional isomers of phosphatidylcholines using LC-OzID

Keywords

Mass spectrometry Liquid chromatography Phospholipids Double bond isomers Ozone-induced dissociation Collision-induced dissociation 

Abbreviations

CID

Collision-induced dissociation

ESI

Electrospray ionisation

HPLC

High-performance liquid chromatography

LC

Liquid chromatography

MS

Mass spectrometry

MS/MS

Tandem mass spectrometry

m/z

Mass-to-charge ratio

OzID

Ozone-induced dissociation

PC

Phosphatidylcholine

TIC

Total ion chromatogram

XIC

Extracted ion chromatogram

Notes

Acknowledgements

RLK is grateful for support through an Australian Postgraduate Award (International) from the University of Wollongong. TWM is an Australian Research Council Future Fellow (FT110100249). SJB and TWM acknowledge project funding from the Australian Research Council through the Discovery (DP120102922) and support from AB SCIEX through the ARC Linkage Program (LP110200648). RLK acknowledges the technical support of Dr Chris Hodgkins (AB SCIEX, Australia) and Dr Alan Maccarone (UOW) and also thanks the latter for provision of Fig. S1.

Author contributions

TWM, JLC and SJB conceived the project. RLK conducted all experiments and performed the data analysis. JLC provided essential input into the experimental configuration including hardware and software aspects. RLK and SJB wrote the main manuscript text and prepared figures. All authors critically reviewed the manuscript and electronic supplementary materials.

Supplementary material

216_2014_8430_MOESM1_ESM.pdf (4.7 mb)
ESM 1 (PDF 4.66 mb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.School of ChemistryUniversity of WollongongWollongongAustralia
  2. 2.Illawarra Health and Medical Research Institute (IHMRI)University of WollongongWollongongAustralia
  3. 3.AB Sciex ConcordOntarioCanada
  4. 4.School of MedicineUniversity of WollongongWollongongAustralia
  5. 5.Central Analytical Research FacilityQueensland University of TechnologyQueenslandAustralia

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