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Table 1 Comparisons of acetoin production from glucose

From: Conversion of cellulose and hemicellulose of biomass simultaneously to acetoin by thermophilic simultaneous saccharification and fermentation

Strain IPE5-4 IPE5-4-UD-4
Fermentation process Shake flask Shake flask Fermenter
Substrate consumption
 Substrate concentration (g L−1) 99.92 ± 0.91 101.83 ± 3.81 120.94 ± 4.02
 Substrate consumption time (h) 72 72 48
 Concentration of residual substrate (g L−1) 52.98 ± 1.93 52.28 ± 2.19 35.38 ± 2.34
 Consumption rate of substrate (g L−1 h−1)a 0.65 0.69 1.78
Acetoin production
 Maximum concentration (g L−1) 11.45 ± 0.11 17.20 ± 0.19 28.83 ± 0.65
 Acetoin yield (g g−1)b 0.24 0.35 0.34
 Acetoin productivity (g L−1 h−1)c 0.16 0.24 0.60
 CAcetoin/C dGlucose 0.33 ± 0.01 0.47 ± 0.03 0.46 ± 0.02
  1. aConsumption rate of substrate was calculated by [initial concentration of specific substrate (g L−1) − residual concentration of specific substrate (g L−1)]/substrate consumption time (h)
  2. bAcetoin yield was calculated by g acetoin/g consumed substrate
  3. cAcetoin productivity was calculated by maximum concentration of acetoin (g L−1)/substrate consumption time (h)
  4. d C Acetoin meant the molar concentration of carbon in acetoin, and C Glucose meant the molar concentration of carbon in glucose