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Table 4 Ethanol fermentation yields of solid fraction after EH and liquid fraction after pretreatment (with and without overliming), and total sugar loss after with overliming

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

   Ethanol fermentation yield1 (Y %T)  
   Solid fraction after EH Liquid fraction Overlimed liquid fraction Total sugar loss after overliming3 (%)
  Control2 84.6 ± 3.8 79.1 ± 1.6 77.7 ± 2.1 NA
Whole-tree chips (WTC) Untreated 82.2 ± 2.7 1.9 ± 0.2 NA NA
Acidic 82.8 ± 0.6 53.2 ± 1.3 NA NA
Alkaline 82.3 ± 0.9 55.0 ± 0.2 NA NA
Neutral 83.4 ± 0.6 49.0 ± 0.4 NA NA
Clean pulp chips (CPC) Untreated 83.7 ± 0.8 1.1 ± 0.0 45.3 ± 0.5 29.5
Acidic 82.5 ± 1.4 52.0 ± 3.2 53.3 ± 1.0 19.4
Alkaline 81.8 ± 1.7 55.1 ± 1.5 64.6 ± 0.6 20.4
Neutral 85.5 ± 2.4 55.6 ± 1.9 54.6 ± 1.3 19.2
  1. Data represented as the mean values of duplicate analysis with standard deviation
  2. NA = Not Applicable
  3. 1 Ethanol fermentation yield is expressed as a percent of theoretical yield (Y %T), according to Eq. 1
  4. 2 The fermentation control contained reagent-grade sugars at similar concentrations to those in experimental samples
  5. 3 Accounting for glucose and xylose only (main sugars present in the liquid fraction after steam pretreatment)