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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: Biotechnol J. 2017 Feb 8;12(4):10.1002/biot.201600399. doi: 10.1002/biot.201600399

Figure 3.

Figure 3

(A) The ion chromatogram and mass spectrum from GC-MS for identification of SCFAs. Total ion chromatogram for separation of the mixture of SCFAs containing acetic acid (Ac), propionic acid (PA), 2H7-butyric acid (*) (an internal standard), isobutyric acid (Iso-BA), butyric acid (BA) and isovaleric acid (Iso-VA) was displayed by running the GC-MS analysis. (B) The level (μg/ml) of each SCFA was quantified. (C) The mass spectra for AC, PA, Iso-BA, BA, and Iso-VA with their corresponding molecular ions (m/z) were shown.