Type of biomass | Sugar ratio | Opt. cell ratioa
| R
bETOH
(g/l h) | [EtOH]c (g/l) |
---|
Glc/Xyl (g/g) |
X
1/X
2 (g/g) | Co-culture | Improve (%)d
| Co-culture | Improve (%)d
|
---|
Rice straw | 3.00 | 1.70 | 0.17 | 35 | 8.00 | 33 |
Corn stover | 1.89 | 1.78 | 0.17 | 55 | 9.17 | 52 |
Cottonwood | 3.23 | 1.70 | 0.17 | 33 | 7.86 | 30 |
Sugarcane bagasse | 1.63 | 1.94 | 0.18 | 63 | 9.68 | 61 |
Corn cobs | 1.29 | 1.86 | 0.19 | 79 | 10.65 | 77 |
Switch grass | 1.45 | 1.86 | 0.18 | 71 | 10.14 | 68 |
Eucalyptus | 4.90 | 1.63 | 0.17 | 23 | 7.22 | 20 |
Wheat straw | 1.58 | 1.94 | 0.18 | 65 | 9.80 | 63 |
- Glucose and xylose ratio for each biomass feedstock is based on biomass feedstock composition and property database
-
aOptimal cell ratio is defined as initial g cell of S. stipitis (X
1) per initial g cell of S. cerevisiae (X
2). The model simulation for each type of feedstock is based on glucose concentration of 15 g/l and xylose concentration according to sugar ratio for each feedstock for comparison purpose
-
bRate of ethanol is defined as overall productivity which is total ethanol produced divided by required fermentation time of co-culture under optimal cell ratio. Fermentation time is the time required for completion of all glucose and xylose by co-culture
-
cEthanol titer of co-culture under optimal cell ratio is predicted by the model based on total glucose and xylose available and 80 % of theoretical yield assumption
-
dPercent improvement is calculated by comparing the performance of co-culture under optimal cell ratio with that of S. cerevisiae based on kinetic model