Table 2.
Effect of the initial pH on D-ribose production performance by B. subtilis UJS0717.
| Initial pH | Initial glucose (g/L) |
Residual glucose (g/L) |
Glucose consumption rate (%) |
Glucose consumption rate (g/L·h) |
Cell concentration (g/L) |
D-Ribose (g/L) |
D-Ribose yield (g/g) |
D-Ribose productivity (g/L·h) |
|---|---|---|---|---|---|---|---|---|
| 6.0 | 122.0 | 11.25 ± 0.12 | 90.78 ± 0.10 | 1.54 ± 0.00 | 7.95 ± 0.15 | 30.92 ± 0.47 | 0.28 ± 0.00 | 0.43 ± 0.00 |
| 6.5 | 122.0 | 8.95 ± 0.05∗ | 92.66 ± 0.04∗ | 1.57 ± 0.00∗ | 8.60 ± 0.25∗ | 31.35 ± 0.35 | 0.28 ± 0.00 | 0.43 ± 0.00 |
| 7.0 | 122.0 | 4.50 ± 0.35∗ | 96.31 ± 0.29∗ | 1.63 ± 0.00∗ | 8.70 ± 0.32∗ | 36.00 ± 0.75∗ | 0.31 ± 0.00∗ | 0.50 ± 0.00∗ |
| 7.5 | 122.0 | 6.85 ± 0.18∗ | 94.39 ± 0.15∗ | 1.60 ± 0.00∗ | 8.35 ± 0.35∗ | 34.57 ± 0.55∗ | 0.30 ± 0.00∗ | 0.48 ± 0.01∗ |
| 8.0 | 122.0 | 8.55 ± 0.14∗ | 92.99 ± 0.11∗ | 1.57 ± 0.00∗ | 8.15 ± 0.25∗ | 31.76 ± 0.68 | 0.28 ± 0.00 | 0.44 ± 0.00∗ |
∗ P < 0.05 compared to pH 6.0 group.