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J Chromatogr A. 2013 Nov 22;1317:239-45. doi: 10.1016/j.chroma.2013.08.095. Epub 2013 Aug 31.

Profiling of soil fatty acids using comprehensive two-dimensional gas chromatography with mass spectrometry detection.

Author information

  • 1Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, VIC 3800, Australia.

Abstract

Profiling of phospholipid fatty acids (PLFA) represents a challenging goal for distinguishing the diversity of microbial communities and biomass in the complex and heterogeneous soil ecosystem. Comprehensive two-dimensional gas chromatography (GC×GC) coupled with simultaneous flame ionisation and mass spectrometry detection was applied as a culture-independent method for PLFA profiling of microbial classification in forest soil. A number of column sets were evaluated for the GC×GC separation of fatty acid methyl esters (FAME). Due to better isomeric separation and compound patterns on the 2D contour plot, an apolar-polar column combination was selected for soil microbial PLFA characterisation. A comprehensive view of PLFA composition with carbon chain length varying from 12 to 20 was observed in forest soil samples, with the commonly reported bacterial FAME of iso-/anteiso-, methyl-branched-, cyclopropyl-, and hydroxyl-substituted FA identified by their mass spectral and retention time according to authentic standards. Notably, some uncommon oxygenated FAME were found in high abundance and were further characterised by GC×GC coupled with high resolution mass spectrometry. This tentatively revealed geometric pairs of methyl 9,10-epoxyoctadecanoate isomers.

KEYWORDS:

Accurate mass spectrometry; Bioactive fatty acid; High resolution separation; Quadrupole time of flight mass spectrometry; Soil microbial fatty acid

PMID:
24041509
DOI:
10.1016/j.chroma.2013.08.095
[PubMed - indexed for MEDLINE]
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