Table 1.
Compositions of EFBs before and after hydrothermal pretreatment
| Biomass component | Compositiona (% of total insoluble solids, w/w) | Recovery yieldb (%, w/w) | |
|---|---|---|---|
| Unpretreated | Pretreated | ||
| Glucan | 37.4 ± 0.6 | 54.7 ± 1.2 | 98.0 |
| Hemicellulose (xylan, arabinan, galactan, and mannan) | 23.9 ± 0.4 | 12.0 ± 0.3 | 33.6 |
| Acid-insoluble lignin | 21.1 ± 0.3 | 30.7 ± 0.7 | 92.7 |
| Acid-soluble lignin | 0.1 ± 0.0 | 0.1 ± 0.0 | |
| Acetyl group | 5.9 ± 0.1 | NM | – |
| Ash | 4.2 ± 0.1 | 0.8 ± 0.0 | – |
| Hot-water extractives | 10.6 ± 0.4 | NA | – |
| Ethanol extractives | 4.8 ± 0.2 | NA | – |
NM not measured; NA not applicable
aExperimental data are expressed as mean ± standard deviation
bBased on the insoluble recovery after washing with water, 67.0% (w/w)