| Chemical component | OPEFB pre-treated by maleic acid | OPEFB pre-treated by oxalic acid | ST pre-treated by maleic acid | SSB pre-treated by kraft pulping |
|---|---|---|---|---|
| EtOH-benzene extractives (%) | 7.56 | 7.49 | 2.24 | Not reported |
| Ash content (%) | 0.57 | 0.83 | 4.34 | Not reported |
| Holocellulose | 70.27 | 71.68 | 69.90 | 93.83 |
| α-cellulose (%) | 60.92 | 61.12 | 39.32 | 64.65 |
| Hemicellulose (%) | 9.35 | 10.56 | 30.58 | 29.18 |
| Lignin | 23.44 | 10.92 | 23.77 | 1.49 |
| Acid insoluble lignin (%) | 19.56 | 10.03 | 19.88 | 0.81 |
| Acid soluble lignin (%) | 3.88 | 0.89 | 3.89 | 0.68 |