Journal
CHEMSUSCHEM
Volume 8, Issue 2, Pages 275-279Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402752
Keywords
biomass; cellulose; crystallinity; enzyme catalysis; hydrolysis
Funding
- Genomic Science Program, Office of Biological and Environmental Research, U. S. Department of Energy [FWP ERKP752]
- Office of Biological and Environmental Research [FWP ERKP291]
- Office of Biological and Environmental Research in the DOE Office of Science through the BESC, a DOE Bioenergy Research Center
- U. S. Department of Energy [DE-AC05-00OR22725]
- Paper Science & Engineering fellowship program
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The effects of different alkaline pretreatments on cellulose structural features and accessibility are compared and correlated with the enzymatic hydrolysis of Populus. The pretreatments are shown to modify polysaccharides and lignin content to enhance the accessibility for cellulase enzymes. The highest increase in the cellulose accessibility was observed in dilute sodium hydroxide, followed by methods using ammonia soaking and lime (Ca(OH)(2)). The biggest increase of cellulose accessibility occurs during the first 10 min of pretreatment, with further increases at a slower rate as severity increases. Low temperature ammonia soaking at longer residence times dissolved a major portion of hemicellulose and exhibited higher cellulose accessibility than high temperature soaking. Moreover, the most significant reduction of degree of polymerization (DP) occurred for dilute sodium hydroxide (NaOH) and ammonia pre-treated Populus samples. The study thus identifies important cellulose structural features and relevant parameters related to biomass recalcitrance.
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