Low melting point pyridinium ionic liquid pretreatment for enhancing enzymatic saccharification of cellulosic biomass

Uju, Aya Nakamoto, Yasuhiro Shoda, Masahiro Goto, Wataru Tokuhara, Yoshiyuki Noritake, Satoshi Katahira, Nobuhiro Ishida, Chiaki Ogino, Noriho Kamiya

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The potential of 1-hexylpyridinium chloride ([Hpy][Cl]), to pretreat cellulosic feedstocks was investigated using microcrystalline cellulose (Avicel) and Bagasse at 80. °C or 100. °C. Short [Hpy][Cl] pretreatments, <30. min, at lower temperature accelerate subsequent enzymatic saccharification of Avicel. Over 95% conversion of pretreated Avicel to glucose was attained after 24. h enzymatic saccharification under optimal conditions, whereas regenerated Bagasse showed 1-3-fold higher conversion than untreated biomass. FT-IR analysis of both Avicel and Bagasse samples pretreated with [Hpy][Cl] or 1-ethyl-3-methyimidazolium acetate ([Emim][OAc]) revealed that these ionic liquids behaved differently during pretreatment. [Hpy][Cl] pretreatment for an extended duration (180. min) released mono- and disaccharides without using cellulase enzymes, suggesting [Hpy][Cl] has capability for direct saccharification of cellulosic feedstocks. On the basis of the results obtained, [Hpy][Cl] pretreatment enhanced initial reaction rates in enzymatic saccharification by either crystalline polymorphic alteration of cellulose or partial degradation of the crystalline cellulosic fraction in biomass.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalBioresource Technology
Volume135
DOIs
Publication statusPublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

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

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