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Table 3 Product yield profiles based on 100 g dry OPT by the conventional ethanol conversion process (CECP) and the efficient ethanol conversion process (EECP)

From: Efficient ethanol production from dried oil palm trunk treated by hydrothermolysis and subsequent enzymatic hydrolysis

  Before hydrothermal treatment After hydrothermal treatment
Process Starch hydrolysis Fermentation Saccharification Fermentation
CECP Not applicable Glc 43.5 ± 0.1 Glc n.d.
XGM 11.2 ± 0.3 XGM 9.7 ± 0.1
Ara 1.1 ± 0.0 Ara 0.8 ± 0.0
   EtOH 22.3 ± 0.0
HMF 0.4 ± 0.0 HMF 0.1 ± 0.0
FF 0.7 ± 0.0 FF n.d.
EECP Glc 25.9 ± 0.1 Glc n.d. Glc 25.6 ± 0.1 Glc n.d.
     XGM 9.6 ± 0.0 XGM 8.7 ± 0.0
     Ara 0.8 ± 0.0 Ara 0.8 ± 0.0
     Acetate 3.5 ± 0.1 Acetate 3.3 ± 0.0
   EtOH 11.9 ± 0.0 EtOH 11.9 ± 0.1a EtOH 25.6 ± 0.1b
     HMF 0.2 ± 0.0 HMF 0.1 ± 0.0
     FF 0.9 ± 0.0 FF n.d.
  1. n.d. not detected
  2. aPre-converted ethanol yield during starch fermentation
  3. bFinal ethanol yield from OPT including pre-converted ethanol