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Table 1 Comparison of the experimental yields obtained in this study with theoretical yields calculated considering anabolism and catabolism

From: Consistent 1,3-propanediol production from glycerol in mixed culture fermentation over a wide range of pH

  Theoretical values Experimental values
Maximal PDO production Minimal growth yield Maximal growth yield Acetate and formate pathway pH 5 pH 6 pH 7 pH 8 pH 9
Y X/S (g/mol)a 4.45 4.45 7.97 5.72 5.39 ± 0.25 6.18 ± 0.62 5.90 ± 0.14 6.15 ± 0.41 5.87 ± 0.80
Y ATP/S (mol/mol)b 0.44 0.44 0.79 0.57 0.51 ± 0.02 0.59 ± 0.06 0.56 ± 0.01 0.59 ± 0.04 0.56 ± 0.07
Y PDO/S (mol/mol) 0.72 0.50 0.11 0.64 0.61 ± 0.04 0.52 ± 0.01 0.64 ± 0.00 0.63 ± 0.01 0.58 ± 0.01
Y Acetate/S (mol/mol) 0.22 0 0 0.28 0.21 ± 0.02 0.21 ± 0.01 0.27 ± 0.01 0.29 ± 0.02 0.25 ± 0.04
Y Ethanol/S (mol/mol) 0 0 0.79 0 0.07 ± 0.05 0.11 ± 0.07 0 0 0
Y Lactate/S (mol/mol) 0 0.44 0 0 0 0.06 ± 0.01 0.01 ± 0.01 0 0.07 ± 0.00
Y(Formate+H2)/S (mol/mol) 0 0 0.79 0.28 0.06 ± 0.01 0.07 ± 0.00 0.01 ± 0.01 0.17 ± 0.01 0.26 ± 0.02
  1. aThe biomass yield was calculated assuming an elemental composition of C4H7O2N [14] and that all the ATP produced was used for biomass production
  2. bThe ATP yield was calculated from the metabolites measured after 3 day of fermentation: Y ATP/Acetate = 2; Y ATP/Ethanol = 1; Y ATP/Lactate = 1; Y ATP/PDO = 0