Demonstration-scale enzymatic saccharification of sulfite-pulped spruce with addition of hydrogen peroxide for LPMO activation

Research output: Contribution to journalArticle

Abstract

The saccharification of lignocellulosic materials like Norway spruce is challenging due to the recalcitrant nature of the biomass, and it requires optimized and efficient pretreatment and enzymatic hydrolysis processes to make it industrially feasible. In this study, we report successful enzymatic saccharification of sulfite-pulped spruce (Borregaard's BALI™ process) at demonstration scale, achieved through the controlled delivery of hydrogen peroxide (H2O2) for the activation of lytic polysaccharide monooxygenases (LPMOs) present in the cellulolytic enzyme preparation. We achieved 85% saccharification yield in 4 days using industrially relevant conditions – that is, an enzyme dose of 4% (w/w dry matter of substrate) of the commercial cellulase cocktail Cellic CTec3 and a substrate loading of 12% (w/w). Addition of H2O2 and the resulting controlled and high LPMO activity had a positive effect on the rate of saccharification and the final sugar titer. Clearly, the high LPMO activity was dependent on feeding the reactors with the LPMO co-substrate H2O2, as in situ generation of H2O2 from molecular oxygen was limited. These demonstration-scale experiments provide a solid basis for the use of H2O2 to improve enzymatic saccharification of lignocellulosic biomass at large industrial scale.

Details

Authors
Organisations
External organisations
  • Norwegian University of Life Sciences
  • Borregaard AS
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Process Engineering
  • Biocatalysis and Enzyme Technology

Keywords

  • biorefining, cellulases, cellulose, hydrogen peroxide, LPMO, lytic polysaccharide monooxygenase, Norway spruce
Original languageEnglish
JournalBiofuels, Bioproducts and Biorefining
Publication statusE-pub ahead of print - 2020 Apr 25
Publication categoryResearch
Peer-reviewedYes