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Table 5 Acetic acid, furfural, 5-hydroxymethyl furfural (HMF), and phenolic concentrations (g/L) at the beginning of fermentation

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

  Acetic acid (g/L) Furfural (g/L) HMF (g/L) Phenolics (g/L) Max dry cell mass (g/L) Ethanol fermentation yield (Y%T)
Untreated 10.0 ± 0.2 1.1 ± 0.1 0.04 ± 0.01 3.6 ± 0.4 5.2 ± 0.1 5.0 ± 0.1
Neutral 7.9 ± 0.5 0.8 ± 0.1 0.02 ± 0.00 2.9 ± 0.7 9.3 ± 0.1 41.0 ± 0.1
Acidic-neutral 5.8 ± 0.1 0.4 ± 0.1 0.02 ± 0.00 2.5 ± 0.2 10.1 ± 0.3 55.0 ± 0.3
Acidic 11.8 ± 0.8 1.2 ± 0.1 0.02 ± 0.01 3.0 ± 0.9 8.9 ± 0.2 42.0 ± 0.1
Controla 12.9 ± 0.4 83.0 ± 0.3
  1. P. stipitis fermentation yield—expressed as percent of theoretical yield (Y%T)—of the pretreatment liquid fraction from untreated and preprocessed biomasses
  2. aThe control represents the fermentation of reagent-grade sugars