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Table 1 Compositional analysis of solids of non-pretreated and IL-pretreated woody samples

From: Comparison of [HSO4], [Cl] and [MeCO2] as anions in pretreatment of aspen and spruce with imidazolium-based ionic liquids

Sample % Dry mass
Klason a ASL b Arabinan Galactan Glucan Xylan Mannan Acetyl
Aspen 12.9 ± 0.2 6.7 ± 0.1 0.7 ± 0.5 1.4 ± 0.1 45.3 ± 1.2 15.9 ± 0.4 2.6 ± 0.1 4.6 ± 0.1
[HSO4] 12.9 ± 0.6 3.5 ± 0.3 ND c ND 62.7 ± 0.6 9.2 ± 0.2 3.4 ± 0.1 1.0 ± 0.1
[Cl] 14.6 ± 0.2 6.8 ± 0.2 ND 1.2 ± 0.1 47.4 ± 0.6 16.5 ± 0.2 2.2 ± 0.1 5.4 ± 0.7
[MeCO2] 17.9 ± 0.4 5.8 ± 0.4 ND 0.9 ± 0.1 53.3 ± 1.3 14.0 ± 0.3 2.3 ± 0.1 1.5 ± 0.1
T-aspen 52.0 ± 1.4 2.8 ± 0.1 ND ND 32.0 ± 0.1 2.6 ± 0.1 1.4 ± 0.1 1.4 ± 0.1
[HSO4] 57.7 ± 0.4 1.5 ± 0.1 ND ND 31.6 ± 1.1 1.4 ± 0.1 ND ND
[Cl] 53.3 ± 0.5 2.1 ± 0.2 ND ND 29.0 ± 0.1 2.3 ± 0.1 ND 1.4 ± 0.3
[MeCO2] 54.1 ± 0.9 2.6 ± 0.1 ND ND 30.1 ± 1.2 2.1 ± 0.1 ND ND
Spruce 28.6 ± 0.8 3.9 ± 0.1 1.0 ± 0.1 2.0 ± 0.1 43.6 ± 0.2 6.0 ± 0.1 11.4 ± 0.1 1.1 ± 0.2
[HSO4] 29.9 ± 0.6 3.1 ± 0.1 ND 0.7 ± 0.1 52.5 ± 0.2 3.7 ± 0.1 8.5 ± 0.1 ND
[Cl] 28.4 ± 0.1 4.9 ± 0.1 1.1 ± 0.1 2.0 ± 0.1 43.7 ± 0.9 6.3 ± 0.1 11.1 ± 0.2 0.8 ± 0.1
[MeCO2] 26.0 ± 0.6 5.0 ± 0.4 0.8 ± 0.1 1.7 ± 0.1 48.3 ± 0.5 4.9 ± 0.1 11.5 ± 0.0 ND
T-spruce 47.3 ± 0.2 5.9 ± 0.4 ND 0.6 ± 0.1 39.9 ± 0.2 1.6 ± 0.1 3.8 ± 0.1 ND
[HSO4] 49.4 ± 1.9 3.6 ± 0.1 ND ND 43.2 ± 0.1 0.9 ± 0.1 2.0 ± 0.1 ND
[Cl] 43.4 ± 0.4 6.0 ± 1.9 ND 0.6 ± 0.1 40.0 ± 1.1 1.5 ± 0.1 3.2 ± 0.1 ND
[MeCO2] 41.8 ± 0.5 5.6 ± 0.2 ND 0.5 ± 0.1 38.9 ± 0.3 1.2 ± 0.0 2.7 ± 0.1 ND
  1. a Klason Klason lignin
  2. b ASL acid-soluble lignin
  3. c ND not detectable
  4. Data based on duplicate measurements