Table 1 The pH values after pretreatment, fermentation inhibitors, monosaccharides concentrations and xylo-oligosaccharides in the prehydrolysate at different pretreated conditions
Additives | Concentration (g/L) | pH after the pretreatment | Fermentation inhibitors (g/L) | Monosaccharides concentration (g/L) | Xylo-oligosaccharide concentration (g/L) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
Formic acid | Acetic acid | Furfural | HMFa | Glucose | Xylose | Arabinose | ||||
Na3PO4 | 1 | 4.0 | 0.5 | 1.8 | 0.0 | 0.0 | 0.1 | 2.2 | 0.5 | 8.6 |
5 | 4.1 | 0.6 | 1.9 | 0.0 | 0.0 | 0.2 | 1.8 | 0.4 | 8.0 | |
10 | 4.3 | 0.7 | 2.0 | 0.0 | 0.0 | 0.0 | 1.1 | 0.2 | 6.9 | |
20 | 4.5 | 1.0 | 2.4 | 0.0 | 0.0 | 0.0 | 0.6 | 0.2 | 6.0 | |
30 | 5.1 | 1.0 | 2.4 | 0.0 | 0.0 | 0.0 | 0.4 | 0.2 | 4.9 | |
Sodium humate | 1 | 4.1 | 0.4 | 1.8 | 0.0 | 0.0 | 0.2 | 2.8 | 0.4 | 5.6 |
5 | 4.1 | 0.2 | 2.1 | 0.0 | 0.0 | 0.2 | 2.9 | 0.4 | 4.4 | |
10 | 4.2 | 0.1 | 2.0 | 0.0 | 0.1 | 0.1 | 2.4 | 0.4 | 4.4 | |
20 | 4.5 | 0.1 | 2.1 | 0.1 | 0.0 | 0.1 | 1.9 | 0.2 | 4.0 | |
30 | 4.7 | 0.0 | 2.1 | 0.0 | 0.0 | 0.1 | 1.6 | 0.2 | 2.8 | |