Fractionation and characterization of lignin streams from unique high-lignin content endocarp feedstocks
Abstract
In this paper, lignin is a promising source of building blocks for upgrading to valuable aromatic chemicals and materials. Endocarp biomass represents a non-edible crop residue in an existing agricultural setting which cannot be used as animal feed nor soil amendment. With significantly higher lignin content and bulk energy density, endocarps have significant advantages to be converted into both biofuel and bioproducts as compared to other biomass resources. Deep eutectic solvent (DES) is highly effective in fractionating lignin from a variety of biomass feedstocks with high yield and purity while at lower cost comparing to certain ionic liquids. In the present study, the structural and compositional features of peach and walnut endocarp cells were characterized. Compared to typical woody and herbaceous biomass, endocarp biomass exhibits significantly higher bulk density and hardness due to its high cellular density. The sugar yields of DES (1:2 choline chloride: lactic acid) pretreated peach pit (Prunus persica) and walnut shell (Juglans nigra) were determined and the impacts of DES pretreatment on the physical and chemical properties of extracted lignin were characterized. Enzymatic saccharification of DES pretreated walnut and peach endocarps gave high glucose yields (over 90%); meanwhile, compared with dilute acid and alkaline pretreatment, DESmore »
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1618740
- Alternate Identifier(s):
- OSTI ID: 1492154
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Biotechnology for Biofuels
- Additional Journal Information:
- Journal Name: Biotechnology for Biofuels Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 1754-6834
- Publisher:
- Springer Science + Business Media
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; Endocarp; Deep eutectic solvent; Pretreatment; Lignin; Biofuel; Biorefinery
Citation Formats
Li, Wenqi, Amos, Kirtley, Li, Mi, Pu, Yunqiao, Debolt, Seth, Ragauskas, Arthur J., and Shi, Jian. Fractionation and characterization of lignin streams from unique high-lignin content endocarp feedstocks. Netherlands: N. p., 2018.
Web. doi:10.1186/s13068-018-1305-7.
Li, Wenqi, Amos, Kirtley, Li, Mi, Pu, Yunqiao, Debolt, Seth, Ragauskas, Arthur J., & Shi, Jian. Fractionation and characterization of lignin streams from unique high-lignin content endocarp feedstocks. Netherlands. https://doi.org/10.1186/s13068-018-1305-7
Li, Wenqi, Amos, Kirtley, Li, Mi, Pu, Yunqiao, Debolt, Seth, Ragauskas, Arthur J., and Shi, Jian. Thu .
"Fractionation and characterization of lignin streams from unique high-lignin content endocarp feedstocks". Netherlands. https://doi.org/10.1186/s13068-018-1305-7.
@article{osti_1618740,
title = {Fractionation and characterization of lignin streams from unique high-lignin content endocarp feedstocks},
author = {Li, Wenqi and Amos, Kirtley and Li, Mi and Pu, Yunqiao and Debolt, Seth and Ragauskas, Arthur J. and Shi, Jian},
abstractNote = {In this paper, lignin is a promising source of building blocks for upgrading to valuable aromatic chemicals and materials. Endocarp biomass represents a non-edible crop residue in an existing agricultural setting which cannot be used as animal feed nor soil amendment. With significantly higher lignin content and bulk energy density, endocarps have significant advantages to be converted into both biofuel and bioproducts as compared to other biomass resources. Deep eutectic solvent (DES) is highly effective in fractionating lignin from a variety of biomass feedstocks with high yield and purity while at lower cost comparing to certain ionic liquids. In the present study, the structural and compositional features of peach and walnut endocarp cells were characterized. Compared to typical woody and herbaceous biomass, endocarp biomass exhibits significantly higher bulk density and hardness due to its high cellular density. The sugar yields of DES (1:2 choline chloride: lactic acid) pretreated peach pit (Prunus persica) and walnut shell (Juglans nigra) were determined and the impacts of DES pretreatment on the physical and chemical properties of extracted lignin were characterized. Enzymatic saccharification of DES pretreated walnut and peach endocarps gave high glucose yields (over 90%); meanwhile, compared with dilute acid and alkaline pretreatment, DES pretreatment led to significantly higher lignin removal (64.3% and 70.2% for walnut and peach endocarps, respectively). The molecular weights of the extracted lignin from DES pretreated endocarp biomass were significantly reduced. 1H–13C HSQC NMR results demonstrate that the native endocarp lignins were SGH type lignins with dominant G-unit (86.7% and 80.5% for walnut and peach endocarps lignins, respectively). DES pretreatment decreased the S and H-unit while led to an increase in condensed G-units, which may contribute to a higher thermal stability of the isolated lignin. Nearly all β-O-4' and a large portion of β-5' linkages were removed during DES pretreatment. In conclusion, the high lignin content endocarps have unique cell wall characteristics when compared to the other lignocellulosic biomass feedstocks. DES pretreatment was highly effective in fractionating high lignin content endocarps to produce both sugar and lignin streams while the DES extracted lignins underwent significant changes in SGH ratio, interunit linkages, and molecular sizes.},
doi = {10.1186/s13068-018-1305-7},
journal = {Biotechnology for Biofuels},
number = 1,
volume = 11,
place = {Netherlands},
year = {Thu Nov 08 00:00:00 EST 2018},
month = {Thu Nov 08 00:00:00 EST 2018}
}
https://doi.org/10.1186/s13068-018-1305-7
Web of Science
Figures / Tables:
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