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Table 1 Chemical composition of untreated and preprocessed poplar biomass (as a percentage of the OD weight)

From: Novel ethanol production using biomass preprocessing to increase ethanol yield and reduce overall costs

  Ash (%) Extractives (%) Glucan (%) Xylan (%) Total sugars* (%) Total lignin (%) Acetic acid (%)
Whole-tree chips (WTC)
 Untreated  1.6 ± 0.1a 10.7 ± 0.1a 42.1 ± 0.9a 14.3 ± 0.3a 60.6 ± 1.2ab 28.6 ± 0.8a 4.8 ± 0.2a
 Acidic 0.5 ± 0.1b 4.6 ± 0.3b 41.4 ± 0.9a 15.3 ± 0.2b 59.5 ± 1.2bc 28.1 ± 0.2ab 5.7 ± 0.7a
 Alkaline 1.6 ± 0.1a 4.3 ± 0.4b 42.5 ± 0.5a 15.6 ± 0.1b 61.8 ± 0.7a 27.6 ± 0.2ab 2.7 ± 0.1b
 Neutral 1.4 ± 0.1c 6.8 ± 0.2c 39.6 ± 0.3b 14.6 ± 0.1a 57.9 ± 0.5c 27.4 ± 0.2b 5.2 ± 0.1a
Clean pulp chips (CPC)
 Untreated 0.6 ± 0.0a 3.5 ± 0.3a 47.9 ± 0.4a 14.4 ± 0.1a 64.7 ± 0.7a 26.1 ± 0.1a 5.0 ± 0.6a
 Acidic 0.1 ± 0.1b 2.0 ± 0.1b 48.4 ± 1.3a 14.4 ± 0.4a 64.9 ± 1.7a 26.1 ± 0.2a 4.4 ± 0.2a
 Alkaline 0.8 ± 0.1c 3.0 ± 0.0c 52.4 ± 0.9b 15.7 ± 0.3b 70.7 ± 1.3b 25.8 ± 0.1a 1.4 ± 0.1b
 Neutral 0.4 ± 0.0d 2.6 ± 0.1d 49.4 ± 0.7a 14.9 ± 0.3a 66.8 ± 1.0a 26.3 ± 0.5a 4.8 ± 0.1a
  1. Data represented as the mean values of triplicate analysis with standard deviation, extractives as duplicates
  2. Different superscript letters indicate statistically significant differences (p < 0.05) within each column by Tukey’s test (WTC and CPC treatments were compared separately)
  3. *Total sugars include glucan, xylan, arabinan, galactan, and mannan