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Table 4 Extracellular metabolites formed in concentrations in excess of 0.1 g/l fermentation broth found in controlled fermentations of test organisms

From: Microbial production host selection for converting second-generation feedstocks into bioproducts

Production host/carbon source Alcohols and lactones Organic acids Amino acids/intermediates
E. coli/glucose ethanol acetic, formic, lactic, orotic, succinic, pyruvic Glutamic, α-ketoglutaric acid,
2,3-dihydroxy-3-methylbutanoic acid
E. coli/xylose ethanol acetic, formic, lactic, propionic, succinic, pyruvic, orotic 2, 3-dihydroxy-3-methylbutanoic acid
E. coli/glycerol ethanol acetic, formic, propionic, succinic glutamic, putrescine, 2, 3-dihydroxy-3-methylbutanoic acid
C. glutamicum/glucose ethanol lactic, succinic, acetic glutamic
C. glutamicum/glycerol ethanol acetic, formic -
S. cerevisiae/glucose ethanol acetic, lactic, malic, pyruvic, citric -
S. cerevisiae/glycerol ethanol acetic, propionic, isobutyric, lactic, isovaleric -
P. stipitis/glucose ethanol pyruvic, malic, acetic -
P. stipitis/xylose ethanol citric, acetic, lactic -
P. stipitis/glycerol ethanol lactic, citric, acetic -
T. reesei/ glucose mannitol malic -
T. reesei/ xylose - - -
A. niger/ glucose gluconic acid lactone, ethanol, erythritol, glycerol gluconic, oxalic, citric, malic, lactic, succinic, acetic, propionic -
A. niger/ xylose arabitol, glycerol, mannitol malic, citric, oxalic, propionic, succinic, acetic, pyruvic -
A. niger/ glycerol - oxalic, propionic, succinic, malic, isocitric, pyruvic citric -
  1. Products produced in excess of 1 g/l fermentation broth are in bold print. The products are listed in order of abundance.