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Comprehensive characterization of non-cellulosic recalcitrant cell wall carbohydrates in unhydrolyzed solids from AFEX-pretreated corn stover

Journal Article · · Biotechnology for Biofuels
 [1];  [2];  [3];  [2];  [2];  [2]
  1. Michigan State Univ., East Lansing, MI (United States), Biomass Conversion Research Lab (BCRL), Chemical Engineering and Materials Science; Michigan State Univ., East Lansing, MI (United States), DOE Great Lakes Bioenergy Research Center (GLBRC); DOE/OSTI
  2. Michigan State Univ., East Lansing, MI (United States), Biomass Conversion Research Lab (BCRL), Chemical Engineering and Materials Science; Michigan State Univ., East Lansing, MI (United States), DOE Great Lakes Bioenergy Research Center (GLBRC)
  3. Univ. of Georgia, Athens, GA (United States), Complex Carbohydrate Research Center; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (US).Biosciences Division, BioEnergy Science Center (BESC)
Inefficient carbohydrate conversion has been an unsolved problem for various lignocellulosic biomass pretreatment technologies, including AFEX, dilute acid, and ionic liquid pretreatments. Previous work has shown 22% of total carbohydrates are typically unconverted, remaining as soluble or insoluble oligomers after hydrolysis (72 h) with excess commercial enzyme loading (20 mg enzymes/g biomass). Nearly one third (7 out of 22%) of these total unconverted carbohydrates are present in unhydrolyzed solid (UHS) residues. The presence of these unconverted carbohydrates leads to a considerable sugar yield loss, which negatively impacts the overall economics of the biorefinery. Current commercial enzyme cocktails are not effective to digest specific cross-linkages in plant cell wall glycans, especially some of those present in hemicelluloses and pectins. Thus, obtaining information about the most recalcitrant non-cellulosic glycan cross-linkages becomes a key study to rationally improve commercial enzyme cocktails, by supplementing the required enzyme activities for hydrolyzing those unconverted glycans.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725; FC02-07ER64494
OSTI ID:
1626982
Journal Information:
Biotechnology for Biofuels, Journal Name: Biotechnology for Biofuels Journal Issue: 1 Vol. 10; ISSN 1754-6834
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Ethanol production potential from AFEX™ and steam-exploded sugarcane residues for sugarcane biorefineries journal May 2018
Cooperative valorization of lignin and residual sugar to polyhydroxyalkanoate (PHA) for enhanced yield and carbon utilization in biorefineries journal January 2019


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