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.

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