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Table 3 Dissolution and degradation of P. trichocarpa wood at various dilute acid pretreatment regimes

From: Natural acetylation impacts carbohydrate recovery during deconstruction of Populus trichocarpa wood

Regime Time (min) H2SO4 Dissolved sugars Wood residue Degraded Xyl O:M Glc O:M Acetate
AA XOS WR AA:XOS:WR
1 10 0.0 33 930 ND 0.6 1.1 0.6 ND 50 1.0:ND:83
2 10 1.0 34 910 ND 1.8 1.1 1.4 ND 48 1.0:ND:34
3 10 3.0 33 880 ND 7.1 1.0 1.4 ND 50 1.0:ND:36
4 10 6.0 33 880 ND 3.2 1.2 1.6 ND 50 1.0:ND:31
5 30 0.0 38 880 ND 100 2.2 0.6 ND 50 1.0:ND:83
6 30 1.0 140 840 ND 4.5 2.1 3.0 12 41 1.0:4.0:13.7
7 30 3.0 280 740 ND 1.1 1.1 18 15 24 1.2:1.0:1.6
8 30 6.0 380 720 ND 0.5 0.5 37 ND 5.4 6.9:ND:1.0
9 60 0.0 280 720 ND 20 4.8 4.1 21 50 1.0:5.1:12.2
10 60 1.0 370 700 ND 0.4 0.3 40 5.5 3.0 13.3:1.8:1.0
11 60 3.0 340 690 74 0.2 0.2 54 ND ND 1.0:ND:ND
12 60 6.0 210 680 230 0.8 0.3 58 ND ND 1.0:ND:ND
  1. Pretreatment temperature was 180 °C. H 2 SO 4 sulphuric acid, Glu glucose, Xyl xylose, O:M oligomer-to-monomer ratio; Acetate partitions into acetic acid (AA), dissolved acetate on xylooligosaccharides (XOS), and acetate on wood residue (WR). ND not detected (less than 5% w/w). Values are the average of three technical replicates. Soluble lignin and minor sugars arabinose, rhamnose and galactose are not included in the mass balance. All values except ratios are mg/g