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Table 1 Chemical composition and mass balance for sugarcane bagasse components before and after pretreatment via an alkaline-sulfite chemithermomechanical process or chlorite delignification

From: Fate of p-hydroxycinnamates and structural characteristics of residual hemicelluloses and lignin during alkaline-sulfite chemithermomechanical pretreatment of sugarcane bagasse

Sample Chemical composition of samplesa (g/100 g of pretreated sample) Solids yield (%) Mass balance (g/100 g of original sugarcane bagasse)
Ligninb Glucan Hemicellulose Lignin Glucan Hemicellulose
Xylan Arabinosyl Acetyl Xylan Arabinosyl Acetyl
Untreated 22.4 ± 0.6 40.0 ± 0.1 21.4 ± 0.1 2.0 ± 0.1 3.6 ± 0.1 100 22.4 40.0 21.4 2.0 3.6
2.5% Na2SO3 + 1.25% NaOH 24.8 ± 0.3 42.3 ± 0.5 20.4 ± 0.2 1.8 ± 0.1 1.4 ± 0.3 86.8 21.5 36.7 17.7 1.6 1.2
5% Na2SO3 + 2.5% NaOH 23.7 ± 0.3 44.0 ± 0.2 19.6 ± 0.1 1.9 ± 0.1 1.1 ± 0.2 84.1 19.9 37.0 16.5 1.6 0.9
10% Na2SO3 + 5% NaOH 16.8 ± 0.5 48.3 ± 0.3 20.5 ± 0.3 2.3 ± 0.1 0.1 ± 0.1 81.8 13.8 39.5 16.8 1.9 0.1
Chlorite-delignification 11.5 ± 0.5 43.8 ± 0.5 25.1 ± 0.7 2.8 ± 0.1 2.4 ± 0.4 85.7 9.9 37.6 21.5 2.4 2.1
  1. aOriginal ash content in untreated sugarcane bagasse was 2.8 ± 0.7%
  2. bTotal lignin contents were not corrected for ash