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Title: Comparative study of lignin characteristics from wheat straw obtained by soda-AQ and kraft pretreatment and effect on the following enzymatic hydrolysis process

Journal Article · · Bioresource Technology
 [1];  [2];  [2];  [3];  [3];  [3];  [3];  [4];  [5]
  1. Hubei Univ. of Technology, Wuhan (China); Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Hubei Univ. of Technology, Wuhan (China)
  3. Georgia Inst. of Technology, Atlanta, GA (United States)
  4. Georgia Inst. of Technology, Atlanta, GA (United States); Univ. of Tennessee, Knoxville, TN (United States)
  5. Hubei Univ. of Technology, Wuhan (China); South China Univ. of Technology, Guangzhou (China)

With this study, to understand the structural changes of lignin after soda-AQ and kraft pretreatment, milled straw lignin, black liquor lignin and residual lignin extracted from wheat straw were characterized by FT-IR, UV, GPC and NMR. The results showed that the main lignin linkages were β-aryl ether substructures (β-O-4'), followed by phenylcoumaran (β-5') and resinol (β-β') substructures, while minor content of spirodienone (β-1'), dibenzodioxocin (5-5') and α,β-diaryl ether linkages were detected as well. After pretreatment, most lignin inter-units and lignin-carbohydrate complex (LCC) linkages were degraded and dissolved in black liquor, with minor amount left in residual pretreated biomass. In addition, through quantitative 13C and 2D-HSQC NMR spectral analysis, lignin and LCC were found to be more degraded after kraft pretreatment than soda-AQ pretreatment. Furthermore, the subsequent enzymatic hydrolysis results showed that more cellulose in wheat straw was converted to glucose after kraft pretreatment, indicating that LCC linkages were important in the enzymatic hydrolysis process.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1327692
Journal Information:
Bioresource Technology, Vol. 207, Issue C; ISSN 0960-8524
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 69 works
Citation information provided by
Web of Science

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Cited By (7)

The Influence of Nonionic Surfactant Adsorption on Enzymatic Hydrolysis of Oil Palm Fruit Bunch journal May 2018
Characteristics of Lignin Fractions from Dilute Acid Pretreated Switchgrass and Their Effect on Cellobiohydrolase from Trichoderma longibrachiatum journal February 2018
Degradation of Vanillin During Lignin Valorization Under Alkaline Oxidation journal July 2018
Characterization and Integrated Process of Pretreatment and Enzymatic Hydrolysis of Corn Straw journal February 2018
A structured understanding of cellobiohydrolase I binding to poplar lignin fractions after dilute acid pretreatment journal April 2018
Degradation of Vanillin During Lignin Valorization Under Alkaline Oxidation book July 2018
Catalytic Fast Pyrolysis of Kraft Lignin With Conventional, Mesoporous and Nanosized ZSM-5 Zeolite for the Production of Alkyl-Phenols and Aromatics journal July 2018