Table 5 The performance of ABE fermentation with various citrate buffer strengths using JAS
| Â | Sodium citrate buffer strengths (mM) | ||||
|---|---|---|---|---|---|
20 | 40 | 60 | 80 | 100 | |
Initial glucose, g/L | 8.0 | 21.9 | 45.9 | 47.2 | 48.9 |
Initial xylose, g/L | 6.3 | 9.6 | 14.3 | 14.6 | 15.6 |
Reducing sugars, g/L | 14.3 | 31.5 | 60.2 | 61.8 | 64.5 |
Residual glucose, g/L | 0.1 | 0.4 | 11.7 | 10.7 | 10.9 |
Residual xylose, g/L | 0.1 | 0.3 | 1.7 | 2.0 | 3.6 |
Maximum OD | 1.7 | 1.8 | 2.2 | 1.8 | 1.8 |
Fermentation time, h | 60 | 60 | 60 | 60 | 60 |
Acetone, g/L | 1.0 | 3.0 | 5.4 | 5.2 | 5.0 |
Ethanol, g/L | 0.15 | 0.10 | 0.17 | 0.18 | 0.17 |
Butanol, g/L | 4.0 | 7.4 | 11.2 | 10.1 | 9.4 |
Total ABE, g/L | 5.2 | 10.6 | 16.8 | 15.4 | 14.6 |
Butanol yield, g/g | 0.28 | 0.24 | 0.24 | 0.21 | 0.19 |
Total ABE yield, g/g | 0.37 | 0.34 | 0.36 | 0.31 | 0.29 |