Preprints
https://doi.org/10.5194/bg-2016-13
https://doi.org/10.5194/bg-2016-13

  18 Jan 2016

18 Jan 2016

Review status: this discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The manuscript was not accepted for further review after discussion.

Technical Note: Rapid Normal-phase Separation of Phytoplankton Lipids by Ultra-High Performance Supercritical Fluid Chromatography (UHPSFC)

J. Brandsma1, T. R. Sutton2,a, J. M. Herniman3, J. E. Hunter3,a, T. E. G. Biggs4, C. Evans4,b, C. P. D. Brussaard4,5, A. D. Postle1, T. J. Jenkins6, and G. J. Langley3 J. Brandsma et al.
  • 1Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
  • 2NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
  • 3Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton, United Kingdom
  • 4NIOZ Royal Netherlands Institute for Sea Research, Texel, The Netherlands
  • 5Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
  • 6Waters Corporation, Wilmslow, United Kingdom
  • acurrent address: Clinical and Experimental Sciences, Faculty of Me dicine, University of Southampton, Southampton, United Kingdom
  • bcurrent address: Natural Environment Research Council, National Oceanography Centre, Southampton, United Kingdom

Abstract. Lipid metabolism is one of the cornerstones of biochemistry, and these chemically diverse biomolecules play key roles in molecular physiology and mediate interactions between microbes and their environment that play out on cell ular to ecosystem scales. Marine phytoplankton fix in the range of 1 billion tonnes of carbon as lipid biomass each year, which goes on to fuel higher trophic levels or ends up in the marine dissolved organic matter pool. Yet despite the importance of the vast marine lipidome for global biogeochemistry, surprisingly little is known about its diverse inventory of molecular structures, or the influence that dynamic environmental conditions exert on microbial lipid synthesis, remodelling and turnover.

To aid in this research, a high-throughput platform for comprehensive analysis of phytoplankton lipids was developed using Ultra-High Performance Supercritical Fluid Chromatography (UHPSFC). This recently developed technology combines a primary supercritical fluid (CO2) mobile phase with an organic co-solvent of choice. Using a simple 10 minute gradient and a sub-2 μm particle column, UHPSFC efficiently separates all of the major neutral and polar lipid classes encountered in phytoplankton in a single analysis. These can then be measured by tandem mass spectrometry using established precursor and neutral mass loss scans.

To demonstrate the analytical power of this novel platform the lipid compositions of a diverse range of phytoplankton species grown in culture, as well as phytoplankton community samples from the Western Antarctic Peninsula, were analysed. With higher chromatographic resolution and a much shorter analysis time than current liquid chromatography methods, the application of U HPSFC has considerable potential to benefit large-scale lipidomic studies, including in the field of environmental microbiology.

J. Brandsma et al.

 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

J. Brandsma et al.

J. Brandsma et al.

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Short summary
Marine phytoplankton fix around 1 billion tonnes of carbon as lipid biomass each year. We present a new method for analysing complex lipid mixtures from phytoplankton biomass using supercritical fluid technology which has better resolution and is several times faster than existing methods. Thus, it enables larger-scale and more in-depth studies of phytoplankton lipid metabolism, the way it is controlled by ecological and environmental processes, and its impact on global biogeochemistry.
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