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Table 5 Fermentation parameters for synthetic media (SM) in presence of various groups of lignocellulose decomposition products (DP) e

From: Designer synthetic media for studying microbial-catalyzed biofuel production

  Biomass yield b (g/g) Xylose consumption (%) Ethanol productivity (g/L/h) Ethanol yield c (g/g) Glycerol yield (g/g) Xylitol yield (g/g) Acetate yield (g/g) Carbon balance closure
18 h 24 h 48 h 24 h 48 h 48 h 48 h 48 h 48 h
Blank SMa 0.078 ± 0.002 66.92 ± 0.18 97.08 ± 0.04 1.29 ± 0.01 0.71 ± 0.01 0.406 ± 0.001 0.058 ± 0.000 0.053 ± 0.002 0.007 ± 0.000 1.00
Blank + Nitrogenous compounds 0.067 ± 0.003 44.69 ± 0.68 86.92 ± 0.61 1.21 ± 0.00 0.69 ± 0.01 0.402 ± 0.007 0.060 ± 0.001 0.055 ± 0.003 0.007 ± 0.000 0.98
Blank + Aliphatic acidsd 0.068 ± 0.002 58.95 ± 0.16 94.17 ± 0.04 1.23 ± 0.01 0.73 ± 0.01 0.427 ± 0.001 0.051 ± 0.000 0.042 ± 0.001 0.002 ± 0.000 1.01
Blank + Aromatic compounds 0.072 ± 0.002 68.70 ± 0.19 88.34 ± 0.04 1.29 ± 0.00 0.72 ± 0.01 0.421 ± 0.001 0.051 ± 0.000 0.032 ± 0.001 0.007 ± 0.000 1.00
Blank + Carbohydrates (oligos) 0.074 ± 0.002 54.68 ± 0.98 94.49 ± 0.50 1.28 ± 0.00 0.73 ± 0.00 0.416 ± 0.001 0.059 ± 0.000 0.043 ± 0.000 0.007 ± 0.000 1.01
Blank + Furans 0.078 ± 0.002 69.25 ± 0.19 96.90 ± 0.04 1.29 ± 0.00 0.72 ± 0.01 0.410 ± 0.001 0.059 ± 0.000 0.052 ± 0.002 0.007 ± 0.000 1.01
Blank + DP in combinationd 0.059 ± 0.002 21.17 ± 0.09 40.05 ± 1.28 1.20 ± 0.01 0.64 ± 0.00 0.440 ± 0.000 0.045 ± 0.000 0.024 ± 0.000 −0.002 ± 0.000 0.99
Actual Hydrolysated 0.065 ± 0.001 14.91 ± 0.53 43.31 ± 0.47 1.26 ± 0.01 0.73 ± 0.00 0.474 ± 0.002 0.048 ± 0.001 0.018 ± 0.000 −0.003 ± 0.001 1.06
  1. aThe blank was the synthetic medium without the addition of decomposition products (DP).
  2. bBiomass yield was based on both glucose and xylose consumed at 18 h fermentation, when the cell density reached the maximum. One unit of absorbance at 600 nm is approximately equal to 0.48 g dry cell wt/L.
  3. cTheoretical metabolic yield of ethanol for both sugars was 0.51 g EtOH/g consumed sugar.
  4. dThe initial concentration of acetate in the hydrolysate and synthetic medium with the addition of aliphatic acids and DP in combination was 1.9 g/L.
  5. eThe t-test results for determining statistically significant differences between the different results are presented in Additional file 1, S2, Tables S2-1 - S2-9.