Table 3.
Composition of the liquid fraction (g/L of liquid fraction) of the pretreated bark samples.
| HT | SE | OS/SE | OS 50:50 | OS 80:20 | OS/NaOH | |
|---|---|---|---|---|---|---|
| total sugars | 0.39 | 2.02 | 2.41 | 1.14 | 1.69 | 2.16 |
| glucose | 0.21 | 0.17 | 0.21 | 0.53 | 0.42 | 0.31 |
| xylose | 0.09 | 0.33 | 0.43 | 0.13 | 0.31 | 0.45 |
| galactose | 0.04 | 0.17 | 0.38 | 0.03 | 0.13 | 0.12 |
| arabinose | 0.02 | 1.04 | 0.69 | 0.45 | 0.85 | 1.28 |
| mannose | 0.01 | 0.09 | n.d. | n.d. | n.d. | n.d. |
| phenolic compounds | 0.13 | 0.20 | 0.27 | 0.74 | 2.74 | 5.74 |
| inhibitors | ||||||
| formic acid | n.d. | 0.25 | 0.90 | 0.16 | 0.67 | 0.67 |
| acetic acid | 2.16 | 1.13 | 2.97 | 0.67 | 1.69 | 2.11 |
| levulininc acid | n.d. | n.d. | n.d. | n.d. | n.d. | n.d. |
| HMF α | 0.37 | 0.05 | 0.46 | 0.07 | 0.06 | 0.12 |
| furfural | 0.61 | 0.18 | 1.13 | 0.06 | 0.09 | 0.27 |
α 5-Hydroxy-methyl-furfural; n.d. Not detected.