Murine Human
CAR-PDMS DVB-CAR-PDMS CAR-PDMS DVB-CAR-PDMS
2,2-dimethylpropanoic acid 2-methyl-1-propanal propanoic acid 2-methyl-2-butenal
2-methylpentanal 2-pentanone 2-methylpropanoic acid butanoic acid, propyl ester
  2-methylfuran 2,2-dimethylpropanoic acid cyclopentane
  2-nonenal N,N-dimethylacetamide 2-pentenal, (E)
  3-methylbutanal 1-propanol 2-ethyl-1-hexanol
  1-penten-3-ol    
  2-heptanal    
Table 1: SPME fibre optimisation. Murine and human faecal samples were analysed using a CAR-PDMS (n=5) or DVB-CAR-PDMS (n=5) SPME fibre. There were 2 and 5 specific compounds found exclusively by CAR-PDMS in murine and human samples respectively, and 7 and 5 found exclusively by DVB-CAR-PDMS in murine and human samples, respectively.