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Table 1 pH-controlled batch fermentations of C. celer on 5 g/l of glucose at different culture pH
| pH | ||||
|---|---|---|---|---|
| 8 | 7 | 6 | 5.5 | |
| μ max (h-1) | 1.50 ± 0.05 | 1.34 ± 0.05 | 0.53 ± 0.01 | 0.45 ± 0.06 |
| Biomass concentration (gCDW/l) | 0.95 ± 0.01 | 0.95 ± 0.06 | 0.76 ± 0.01 | 0.42 ± 0.01 |
| q glucose a (mmol/gCDW/h) | 19.6 ± 1.4 | 20.6 ± 0.1 | 14.3 ± 0.1 | 14.0 ± 0.2 |
| YX/ATP (gCDW/mol ATP) | 15.4 ± 0.7 | 15.2 ± 0.4 | 6.8 ± 0.2 | 6.0 ± 0.4 |
| YATP/S (mol ATP/mol glucose) | 2.81 ± 0.02 | 3.05 ± 0.03 | 3.54 ± 0.33 | 3.60 ± 0.09 |
| H2 accumulation (mmol H2/l) | 68.0 ± 1.3 | 64.2 ± 1.1 | 106.0 ± 2.3 | 91.7 ± 0.4 |
| Q H2 (mmol H2/l/h) | 25.2 ± 1.2 | 21.0 ± 1.3 | 14.9 ± 0.2 | 13.0 ± 0.9 |
| Product yield (mol/mol glucose) | ||||
| YX b | 1.29 ± 0.05 | 1.37 ± 0.07 | 1.04 ± 0.01 | 0.62 ± 0.02 |
| YH2 b | 1.90 ± 0.01 | 1.69 ± 0.03 | 2.97 ± 0.10 | 2.48 ± 0.03 |
| YA b | 1.04 ± 0.01 | 1.02 ± 0.04 | 1.33 ± 0.08 | 1.28 ± 0.04 |
| YF b | 0.45 ± 0.01 | 0.37 ± 0.11 | 0.14 ± 0.02 | 0.19 ± 0.01 |
| YE b | 0.35 ± 0.01 | 0.48 ± 0.05 | 0.20 ± 0.01 | 0.36 ± 0.03 |
| RVEP c | 2.60 ± 0.03 | 2.65 ± 0.13 | 3.36 ± 0.09 | 3.19 ± 0.02 |
| HAc/EtOH | 2.96 ± 0.11 | 2.15 ± 0.30 | 6.83 ± 0.67 | 3.60 ± 0.14 |
| Carbon recovery (%) | 88.6 ± 1.1 | 99.8 ± 1.5 | 100.7 ± 2.8 | 93.5 ± 1.6 |
| Redox recovery (%) | 94.4 ± 0.6 | 99.2 ± 0.7 | 98.4 ± 3.2 | 93.6 ± 2.1 |
