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Table 3 Chemical composition of liquid and solid fraction after steam explosion and cellulose-to-glucose conversion during enzymatic of untreated and preprocessed poplar biomasses

From: Removal of non-structural components from poplar whole-tree chips to enhance hydrolysis and fermentation performance

  Pretreatment condition Liquid fraction Solid fraction
Sugar recovery Solid yield (%) Chemical composition Enzymatic hydrolysis
Combined severity2 pH Glucose Xylose Total sugars1 Glucan (%) Xylan (%) Lignin (%) Ash (%) Glucose conversion (%)
kg/tonne Mon3 % kg/tonne Mon % kg/tonne Mon %
Untreated 1.72 1.78 79.1 ± 0.1 75.4 114.8 ± 1.5 70.8 232.4 ± 1.8 72.9 54.8 59.3 ± 0.8 1.7 ± 0.0 36.9 ± 0.6 1.4 ± 0.1 62.4 ± 0.8
Neutral 1.84 1.66 85.6 ± 0.0 83.0 148.5 ± 0.7 80.3 279.4 ± 1.3 81.5 54.4 58.7 ± 1.1 1.9 ± 0.0 35.0 ± 2.5 0.7 ± 0.0 68.3 ± 0.7
Acidic-neutral 1.88 1.62 66.1 ± 0.2 86.0 135.3 ± 0.5 81.1 235.1 ± 0.3 82.8 58.8 59.8 ± 1.1 2.3 ± 0.0 36.4 ± 0.3 0.3 ± 0.1 74.1 ± 1.0
Acidic 2.08 1.42 88.1 ± 0.1 85.8 118.6 ± 0.8 83.1 241.6 ± 0.9 84.3 53.7 58.1 ± 0.2 0.6 ± 0.0 38.9 ± 0.6 0.4 ± 0.1 76.0 ± 5.2
  1. 1Total sugars represent the combination of glucose, xylose, arabinose, galactose, and mannose as anhydrosugars
  2. 2“Combined severity” (CS) is defined based on reaction temperature (TH °C), time (t, min), reference temperature (TR, 100 °C), and pH (measured from the liquid fraction after pretreatment). CS = logR0 − pH, where R0 = t × [exp (TH − TR)/14.75]
  3. 3“Mon” represents “monomeric”