Journal
BIORESOURCE TECHNOLOGY
Volume 144, Issue -, Pages 232-239Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.06.100
Keywords
Biomass recalcitrance; Enzymatic hydrolysis; Fiber size; Swelling; Surface area
Funding
- National Science Foundation [1067012]
- U. S. Department of Energy's Office of Biological and Environmental Research
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1067012] Funding Source: National Science Foundation
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To clarify the specific effect of biomass substrate surface area on its enzymatic digestibility, factors of fiber size reduction and swelling changes were investigated by using poplar substrates with controlled morphological and chemical properties after modified chemical pulping. Results showed that fiber size changes had insignificant influence on enzymatic hydrolysis, although the external surface area increased up to 41% with the reduction of fiber size. Swelling changes caused by increased biomass fiber porosities after PFI refining showed a significant influence on the efficiency of enzymatic hydrolysis. It is also found that chemical properties such as xylan and lignin content can influence the swelling effect. Xylan is confirmed to facilitate substrate hydrolysability by swelling, while lignin restricts swelling effect and thus minimizes the enzyme accessibility to substrates. (c) 2013 Elsevier Ltd. All rights reserved.
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