Fatty acids by GC-TOF-MS

Determination of fatty acid composition by GC-FID or GC-MS in biological matrices is best performed after transmethylation of the sample extract. The method detects and quantifies fatty acid methyl esters (FAMES - evenly numbered fatty acids found in eucariotic cells) and detects and calculates the area of bacterial acid methyl esters (BAMES - odd numbered fatty acids found in bacteria).

NUMBER OF SAMPLES: 30-70 samples (analysis of fewer or more samples has to be discussed with SMC).
MATRICES: Plasma, serum, and CSF (other matrices have to be communicated with SMC).

SMC is an independent partner and will be mentioned in the acknowledgements if the data is published


  • Sample preparation (eg. Folch extraction, with chloroform/methanol phase separation or methanol/water extraction)
  • Analysis by GC-MS TOF
  • Quality assurance of the analysis
  • Targeted data analysis of FAMES and BAMES
  • Generation of a table of relevant unknown integrated peak areas (annotated with retention time/index and mass)
  • Quantification of FAMES
  • Initial statistical evaluation of the generated data according to the question asked in the project (multivariate and univariate data analysis)
  • Initial identification of unknown compounds deemed relevant for the project (around 10-20 metabolites)
  • Storage of a pooled sample for possible future extended identification (extended identification is not included)
  • Report and feedback
  • Archiving of raw data