Improved enzymatic hydrolysis yield of rice straw using electron beam irradiation pretreatment

Jin Seop Bak, Ja Kyong Ko, Young Hwan Han, Byung Cheol Lee, In Geol Choi, Kyoung Heon Kim

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

Rice straw was irradiated using an electron beam at currents and then hydrolyzed with cellulase and β-glucosidase to produce glucose. The pretreatment by electron beam irradiation (EBI) was found to significantly increase the enzyme digestibility of rice straw. Specifically, when rice straw that was pretreated by EBI at 80 kGy at 0.12 mA and 1 MeV was hydrolyzed with 60 FPU of cellulase and 30 CBU of β-glucosidase, the glucose yield after 132 h of hydrolysis was 52.1% of theoretical maximum. This value was significantly higher than the 22.6% that was obtained when untreated rice straw was used. In addition, SEM analysis of pretreated rice straw revealed that EBI caused apparent damage to the surface of the rice straw. Furthermore, EBI pretreatment was found to increase the crystalline portion of the rice straw. Finally, the crystallinity and enzyme digestibility were found to be strongly correlated between rice straw samples that were pretreated by EBI under different conditions.

Original languageEnglish
Pages (from-to)1285-1290
Number of pages6
JournalBioresource technology
Volume100
Issue number3
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Biofuel
  • Biomass
  • Electron beam irradiation
  • Lignocellulose
  • Pretreatment

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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