Table 3.
Summary of duplicate fed-batch simultaneous saccharification and co-fermentation of wheat straw (8%-11% WIS)
| Fed-batch SSCF |
Enzyme feed profile | Xylose consumptiona (%) |
Xylitol formationb (%) |
Final ethanol concentration (g L-1) | Ethanol yield (g/g) | Ethanol yieldc (%) |
|---|---|---|---|---|---|---|
| I | A | 38 | 12 | 33.7 | 0.31 | 61 |
| II | B | 50 | 8 | 37.4 | 0.35 | 68 |
| III | C | 46 | 6 | 34.9 | 0.33 | 65 |
| IV | Dd | 49 | 9 | 38.0 | 0.35 | 69 |
| REF | No feed | 40 | 7 | 33.0 | 0.31 | 61 |
In all experiments, a total enzyme load of 36 FPU (g glucan)-1 and a yeast load of 4 g L-1 were used.
a Related to total amount of available xylose.
b Related to consumed xylose.
c Corresponding to the maximum theoretical yield on total available sugars.
d An extra yeast addition (2 g L-1) was made at t = 24 h (see last paragraph in the results section).