|
Biomass
|
Grass
|
Grass silage
|
|---|
|
HTT temperature
|
170
|
180
|
190
|
170
|
180
|
190
|
|---|
| |
(w/w)% of DM
|
(w/w)% of DM
|
|---|
|
Glucan
|
31.2d ± 0.45
|
33.0d ± 0.16
|
35.0cd ± 0.43
|
36.9c ± 0.43
|
40.6b ± 0.00
|
42.8a ± 1.10
|
|
Xylan
|
18.7a ± 0.40
|
17.1b ± 0.05
|
10.3c ± 0.09
|
19.1a ± 0.09
|
17.5b ± 0.35
|
10.0c ± 0.21
|
|
Arabinan
|
2.7a ± 0.01
|
1.8b ± 0.07
|
1.0d ± 0.00
|
2.7a ± 0.00
|
1.3c ± 0.01
|
0.5e ± 0.01
|
|
Klason lignin
|
18.8a ± 0.59
|
19.0a ± 0.67
|
17.0a ± 0.58
|
13.8b ± 0.58
|
13.5b ± 0.07
|
13.9b ± 0.30
|
|
Ash
|
7.4ab ± 0.52
|
8.2a ± 0.18
|
8.4a ± 0.11
|
7.8ab ± 0.11
|
6.8b ± 0.09
|
6.8b ± 0.02
|
|
Ethanol Extractives
|
11.8c ± 0.35
|
16.4b ± 0.49
|
22.8a ± 0.86
|
15.4b ± 0.16
|
18.2b ± 0.76
|
24.5a ± 0.61
|
|
Residual
|
9.5
|
4.4
|
5.6
|
4.2
|
2.2
|
1.4
|
|
DM recovery in solid fraction
|
75.3
|
69.6
|
61.6
|
67.5
|
61.5
|
58.8
|
- Numbers are presented as weight percentages of DM in the HTT solid fraction, followed by standard deviations (except for ‘DM recovery in solid fraction’, which is the percentage of DM left in solid fraction after HTT pretreatment, based on mass balance after HTT pretreatment. Different superscript letters indicate significantly different values (P <0.05) row-wise; (similar superscript letters indicate no statistically significant difference). DM, dry matter; HTT, hydrothermal treatment.
