Table 4.
Sugar yields after enzymatic hydrolysis a
| |
Untreated |
||||
|---|---|---|---|---|---|
| Fraction | Arabinose | Galactose | Glucose | Mannose | Xylose |
| Juvenile heartwood |
0.2 ± 0.1 |
0.4 ± 0.1 |
3.0 ± 0.3 |
0.7 ± 0.1 |
0.3 ± 0.1 |
| Mature heartwood |
0.2 ± 0.1 |
0.4 ± 0.1 |
3.3 ± 0.3 |
0.8 ± 0.1 |
0.3 ± 0.1 |
| Juvenile sapwood |
0.5 ± 0.1 |
0.7 ± 0.1 |
4.1 ± 0.2 |
0.9 ± 0.2 |
0.4 ± 0.2 |
| Mature sapwood |
0.2 ± 0.2 |
0.4 ± 0.2 |
3.3 ± 0.1 |
0.9 ± 0.2 |
0.3 ± 0.2 |
| Bark |
0.2 ± 0.1 |
0.4 ± 0.1 |
6.4 ± 0.6 |
0.8 ± 0.1 |
0.3 ± 0.1 |
| Top parts |
0.2 ± 0.1 |
0.4 ± 0.1 |
3.0 ± 0.3 |
0.7 ± 0.1 |
0.3 ± 0.1 |
| Knotwood |
0.2 ± 0.1 |
0.4 ± 0.1 |
3.3 ± 0.3 |
0.8 ± 0.1 |
0.3 ± 0.1 |
| |
Pretreatment severity: mild |
||||
|
Fraction
|
Arabinose
|
Galactose
|
Glucose
|
Mannose
|
Xylose
|
| Juvenile heartwood |
n.d.b |
0.58 ± 0.1 |
6.9 ± 2.6 |
0.7 ± 0.1 |
n.d. |
| Mature heartwood |
n.d. |
0.62 ± 0.1 |
8.4 ± 1.3 |
0.8 ± 0.1 |
n.d. |
| Juvenile sapwood |
n.d. |
0.65 ± 0.1 |
8.5 ± 1.0 |
0.8 ± 0.1 |
n.d. |
| Mature sapwood |
n.d. |
0.64 ± 0.1 |
10.6 ± 0.7 |
0.9 ± 0.2 |
n.d. |
| Bark |
n.d. |
0.63 ± 0.1 |
8.1 ± 1.3 |
0.8 ± 0.1 |
n.d. |
| Top parts |
n.d. |
0.62 ± 0.1 |
10.5 ± 2.3 |
0.8 ± 0.1 |
n.d. |
| Knotwood |
n.d. |
0.61 ± 0.1 |
10.6 ± 2.4 |
0.8 ± 0.1 |
n.d. |
| |
Pretreatment severity: medium |
||||
|
Fraction
|
Arabinose
|
Galactose
|
Glucose
|
Mannose
|
Xylose
|
| Juvenile heartwood |
n.d. |
n.d. |
10.1 ± 1.8 |
n.d. |
n.d. |
| Mature heartwood |
n.d. |
n.d. |
8.3 ± 0.7 |
n.d. |
n.d. |
| Juvenile sapwood |
n.d. |
n.d. |
12.3 ± 1.0 |
n.d. |
n.d. |
| Mature sapwood |
n.d. |
n.d. |
12.1 ± 2.4 |
n.d. |
n.d. |
| Bark |
n.d. |
n.d. |
7.5 ± 0.9 |
n.d. |
n.d. |
| Top parts |
n.d. |
n.d. |
9.2 ± 2.2 |
n.d. |
n.d. |
| Knotwood |
n.d. |
n.d. |
10.5 ± 1.4 |
n.d. |
n.d. |
| |
Pretreatment severity: severe |
||||
|
Fraction
|
Arabinose
|
Galactose
|
Glucose
|
Mannose
|
Xylose
|
| Juvenile heartwood |
n.d. |
n.d. |
18.0 ± 1.4 |
n.d. |
n.d. |
| Mature heartwood |
n.d. |
n.d. |
15.8 ± 2.3 |
n.d. |
n.d. |
| Juvenile sapwood |
n.d. |
n.d. |
17.9 ± 2.5 |
n.d. |
n.d. |
| Mature sapwood |
n.d. |
n.d. |
14.6 ± 3.0 |
n.d. |
n.d. |
| Bark |
n.d. |
n.d. |
14.7 ± 0.3 |
n.d. |
n.d. |
| Top parts |
n.d. |
n.d. |
15.9 ± 2.0 |
n.d. |
n.d. |
| Knotwood | n.d. | n.d. | 16.6 ± 0.5 | n.d. | n.d. |
aYield in g sugar 100 g-1 wood (dry weight) in samples taken after 72 h and analyzed using HPAEC. Mean values and standard deviations based on three replicates.
bNot detected: yield <0.001 g sugar 100 g-1 wood (values under the lowest standard, 0.5 ppm, in the calibration curve).