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Table 3 Effects of fermentation pH on metabolic product profiles

From: Consolidated bioprocessing of butanol production from xylan by a thermophilic and butanologenic Thermoanaerobacterium sp. M5

pH 4.0 5.0 5.5 6.0 6.5 7.0 7.5 8.0 9.0 10.0
Butanol (g/L) 0.020 ± 0.011 0.037 ± 0.015 0.055 ± 0.008 0.097 ± 0.027 0.297 ± 0.058 0.467 ± 0.050 0.596 ± 0.067 0.489 ± 0.087 0.093 ± 0.002 0.046 ± 0.001
Ethanol (g/L) 0.538 ± 0.019 0.602 ± 0.001 0.633 ± 0.064 0.644 ± 0.141 0.976 ± 0.057 1.212 ± 0.460 2.270 ± 0.375 2.438 ± 0.258 1.942 ± 0.426 0.335 ± 0.094
Acetate (g/L) 0.610 ± 0.026 3.980 ± 0.050 4.052 ± 0.065 3.351 ± 0.534 2.947 ± 0.102 3.061 ± 0.763 3.340 ± 0.211 2.909 ± 0.820 2.834 ± 0.356 0.413 ± 0.108
Butyrate (g/L) 0.539 ± 0.134 4.950 ± 0.207 6.041 ± 0.241 5.385 ± 0.623 4.272 ± 0.297 3.095 ± 0.214 3.052 ± 0.548 2.164 ± 0.679 2.533 ± 0.475 0.157 ± 0.389
  1. Error bars correspond to the standard deviation of triplicates