Remarkable solvent and extractable lignin effects on enzymatic digestibility of organosolv pretreated hardwood

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Lai, Chenhuan, Maobing Tu, Mi Li, and Shiyuan Yu. 2014. Bioresource Technology 156 (0): 92–99. doi:10.1016/j.biortech.2014.01.030.

Type Journal Article
Author Chenhuan Lai
Author Maobing Tu
Author Mi Li
Author Shiyuan Yu
URL http://dx.doi.org/10.1016/j.biortech.2014.01.030
Volume 156
Issue 0
Pages 92-99
Publication Bioresource Technology
ISSN 0960-8524
Date January 17, 2014
Journal Abbr Bioresource Technology
DOI 10.1016/j.biortech.2014.01.030
Abstract Abstract Low solvent concentration effect on substrate digestibility of ethanol organosolv pretreated sweetgum was examined. Surprisingly, lower ethanol concentration in organosolv pretreatments resulted in faster initial rates and higher 72 h hydrolysis yields in pretreated substrates. A strong correlation (r2 = 0.96) between pretreatment combined severity factor and residual xylan/glucan ratio was observed. The residual xylan/glucan ratio was associated with the initial hydrolysis rate closely. Furthermore, it was found that preserving extractable lignin in the pretreated substrates could improve enzymatic hydrolysis yield by 33%. This has an important implication in reducing the pretreatment and enzyme cost, because the typical solvent washing after pretreatment could be eliminated and preserving extractable lignin could reduce enzyme loading. Finally, we observed that xylan removal by xylanase could improve the initial rate by 53% and increase the 72 h hydrolysis yield by 21%. The extractable lignin precipitation on pretreated substrates increased the 72 h hydrolysis yield by 10%.

Keywords:

  • biomass
  • Combined severity factor
  • Enzymatic hydrolysis
  • Hydrolysis
  • Langmuir adsorption isotherm
  • Lignins
  • Organosolv pretreatment
  • Solvents
  • Xylans
  • Yields

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