Table 1.
Comparison of cellobiose-galactose cofermentation result with sole-carbon-source fermentation by engineered S. cerevisiae (D452-2BT)a
| Added sugar (concn) for fermentation expt | OD (A600) | EtOH concn (g/liter) | EtOH yield (g/g) | Vol PEtOH (g ethanol/liter·h) | Sp. PEtOH (g ethanol/g cell·h) |
|---|---|---|---|---|---|
| Cellobiose (40 g/liter) | 18 ± 0.59 | 13 ± 0.30 | 0.34 ± 0.01 | 0.37 ± 0.01 | 0.17 ± 0.02 |
| Galactose (40 g/liter) | 14 ± 0.06 | 14 ± 0.12 | 0.36 ± 0.01 | 0.61 ± 0.01 | 0.26 ± 0.02 |
| Cellobiose (20 g/liter) + galactose (20 g/liter) | 12 ± 1.02 | 13 ± 0.80 | 0.35 ± 0.02 | 0.59 ± 0.04 | 0.32 ± 0.01 |
| Cellobiose (40 g/liter) + galactose (40 g/liter) | 23 ± 0.20 | 27 ± 0.04 | 0.36 ± 0.01 | 0.75 ± 0.02 | 0.33 ± 0.02 |
| Glucose (40 g/liter) + galactose (40 g/liter) | 14 ± 0.04 | 21 ± 0.93 | 0.34 ± 0.01 | 0.58 ± 0.01 | 0.35 ± 0.02 |
a
Vol PEtOH and Sp. PEtOH denote volumetric ethanol (EtOH) productivity and specific EtOH productivity, respectively. All values are the means of results of two independent fermentations; errors represent the standard deviations of results between two fermentations. Sp. PEtOH was calculated during the period from 0 to 24 h of each fermentation.