Pretreatment of rice straw with ammonia and ionic liquid for lignocellulose conversion to fermentable sugars

Tam Anh D. Nguyen, Kyoung Rok Kim, Se Jong Han, Hwa Young Cho, Jin Woo Kim, Sung Min Park, Jae Chan Park, Sang Jun Sim

Research output: Contribution to journalArticlepeer-review

240 Citations (Scopus)


Pretreatment technology is a prerequisite to facilitate the release of sugars from a lignocellulosic biomass prior to fermentation. Recently, some pretreatment methods have been tried with ionic liquids, but they were still expensive and unpractical. In this study, an efficient pretreatment method using ammonia and ionic liquid was developed for the recovery of bio-digestible cellulose from a lignocellulosic byproduct, rice straw, and the increase of ionic liquid utilization. The combined use of ammonia and ionic liquid ([Emim]Ac) treatment exhibited a synergy effect for rice straw with 82% of the cellulose recovery and 97% of the enzymatic glucose conversion. This cooperative effect showed over 90% of the glucose conversion even with a reduced enzyme usage and incubation time. The ionic liquid was successfully recycled more than 20 times. The 20th-recycled ([Emim]Ac) showed 74% of the cellulose recovery and 78% of the glucose conversion to rice straw. Compared with the conventional pretreatment, our combined method for lignocellulosic biomass pretreatment was an economical and eco-friendly.

Original languageEnglish
Pages (from-to)7432-7438
Number of pages7
JournalBioresource technology
Issue number19
Publication statusPublished - 2010 Oct
Externally publishedYes


  • Ammonia
  • Combined pretreatment
  • Ionic liquids
  • Lignocellulose

ASJC Scopus subject areas

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


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