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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