Conversion of bark-rich biomass mixture into fermentable sugar by two-stage dilute acid-catalyzed hydrolysis

Kyoung Heon Kim, Melvin Tucker, Quang Nguyen

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58 Citations (Scopus)


Despite high availability and low cost, bark has not actively been considered as a biomass feedstock for producing bio-based products due to its high content of extractives and lignin. In this study, to investigate the feasibility of utilizing bark-rich sawmill residues for producing value-added materials, the mixed Hemlock hog fuel/pin chips (85:15 by dry weight) from a local sawmill were converted into fermentable sugar by two-stage dilute sulfuric acid-catalyzed hydrolysis. Combining the sugar yields from the first-stage (190°C for 150 s with 1.1% acid) and second-stage (210°C for 115 s with 2.5% acid) hydrolyses, which aimed to maximize the recovery of mannose/galactose and glucose, respectively, 13.6 g of glucose (46% theoretical maximum), 10.5 g of mannose and galactose (98% theoretical maximum), and 2.8 g of xylose (85% theoretical maximum) were obtained per 100 g of the original dry feedstock.

Original languageEnglish
Pages (from-to)1249-1255
Number of pages7
JournalBioresource Technology
Issue number11
Publication statusPublished - 2005 Jul 1



  • Bark
  • Biomass
  • Hemlock
  • Pretreatment
  • Sawmill residues
  • Softwood
  • Sugar
  • Two-stage dilute acid-catalyzed hydrolysis

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Food Science
  • Process Chemistry and Technology
  • Applied Microbiology and Biotechnology

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