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Table 2 Composition of the steam-pretreated substrates

From: Enzymatic hydrolysis of steam-pretreated lignocellulosic materials with Trichoderma atroviride enzymes produced in-house

   Spruce (SPS) Wheat straw (SPWS) Bagasse (SPB)
   g/L whole slurry % of WIS g/L whole slurry % of WIS g/L whole slurry % of WIS
  Total DM 203.2 - 113.1 - 138.9 -
  WIS 135.2 - 77.1 - 98.5 -
Solid fraction Glucan 73.1 54.0 50.2 65.1 59.6 60.5
  Xylan n.d. n.d. 1.6 2.1 6.6 6.7
  Galactan 0.7 0.5 0.5 0.6 n.d. n.d.
  Arabinan n.d. n.d. 0.9 1.2 0.3 0.3
  Mannan 3.1 2.3 n.d. n.d. n.d. n.d.
  Insoluble lignin 57.2 42.3 20.9 27.2 26.6 27.0
Liquid fraction Glucose 22.4 - 2.3 - 2.6 -
  Glucose oligomers 1.7 - 0.6 - 1.3 -
  Xylose 9.7 - 21.8 - 10.9 -
  Xylose oligomers n.d. - 3.5 - 18.1 -
  Galactose 4.1 - 1.1 - 0.8 -
  Galactose       
  oligomers n.d. - 0.1 - 0.7 -
  Arabinose 2.3 - 3.3 - 1.5 -
  Arabinose       
  Oligomers n.d. - n.d. - 0.6 -
  Mannose 20.9 - n.d. - 0.8 -
  Mannose       
  oligomers 0.1 - n.d. - n.d. -
  Lactic acid* 2.4 - 0.1 - 0.5 -
  Glycerol n.d. - n.d. - 0.3 -
  Acetic acid 4.6 - 2.1 - 3.6 -
  HMF 2.3 - 0.3 - 0.1 -
  Furfural 1.4 - 1.0 - 1.0 -
  Soluble lignin 2.3 - 2.1 - 3.0 -
  1. WIS, water-insoluble solids; DM, dry matter; HMF, hydroxymethylfurfural, n.d., not detected
  2. *The lactic acid component was probably some other organic acid that had the same retention time as lactic acid.
  3. The values presented are the average of two separate measurements, and the standard deviations are <5%.