Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment
Deep eutectic solvents (DESs) can efficiently promote the efficiency of cellulose enzymatic hydrolysis through the removal of lignin component in lignocellulosic biomass pretreatment. Unraveling the fundamental structural variant of lignin during DES treatment would facilitate to understand the DES-...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-04-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fenrg.2020.00048/full |
| _version_ | 1819148237596000256 |
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| author | Shuizhong Wang Helong Li Ling-Ping Xiao Ling-Ping Xiao Guoyong Song |
| author_facet | Shuizhong Wang Helong Li Ling-Ping Xiao Ling-Ping Xiao Guoyong Song |
| author_sort | Shuizhong Wang |
| collection | DOAJ |
| description | Deep eutectic solvents (DESs) can efficiently promote the efficiency of cellulose enzymatic hydrolysis through the removal of lignin component in lignocellulosic biomass pretreatment. Unraveling the fundamental structural variant of lignin during DES treatment would facilitate to understand the DES-based biomass pretreatment in a clear perspective. Herein, an enzymatic mild acidolysis lignin (EMAL) and a series of β-O-4 lignin model compounds were employed to be treated with choline chloride (ChCl)/lactic acid (LA) (1:2) DES, from which the structural variant of all lignin fractions can be realized in a detailed version. The β-O-4 linkages, existing in either realistic lignin or model compounds, could be cleaved by ChCl/LA, thus leading to the decrease of molecular weight and the rise of hydroxyl groups. The influence of reaction temperature and time was also examined in view of some key structural parameters. Experimental evidences from model compounds confirmed that the repolymerization occurs with the depolymerization of lignin, which may account for the low production of monomeric products during DES treatment. |
| first_indexed | 2024-12-22T13:42:31Z |
| format | Article |
| id | doaj.art-144a9b021af846b39bb08022b2c7c7aa |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-22T13:42:31Z |
| publishDate | 2020-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-144a9b021af846b39bb08022b2c7c7aa2022-12-21T18:23:53ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2020-04-01810.3389/fenrg.2020.00048534356Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent TreatmentShuizhong Wang0Helong Li1Ling-Ping Xiao2Ling-Ping Xiao3Guoyong Song4Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, ChinaBeijing Key Laboratory of Lignocellulosic Chemistry, Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, ChinaLiaoning Key Laboratory of Pulp and Paper Engineering, Center for Lignocellulose Chemistry and Biomaterials, School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, ChinaGuangxi Key Laboratory of Clean Pulp and Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning, ChinaBeijing Key Laboratory of Lignocellulosic Chemistry, Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, ChinaDeep eutectic solvents (DESs) can efficiently promote the efficiency of cellulose enzymatic hydrolysis through the removal of lignin component in lignocellulosic biomass pretreatment. Unraveling the fundamental structural variant of lignin during DES treatment would facilitate to understand the DES-based biomass pretreatment in a clear perspective. Herein, an enzymatic mild acidolysis lignin (EMAL) and a series of β-O-4 lignin model compounds were employed to be treated with choline chloride (ChCl)/lactic acid (LA) (1:2) DES, from which the structural variant of all lignin fractions can be realized in a detailed version. The β-O-4 linkages, existing in either realistic lignin or model compounds, could be cleaved by ChCl/LA, thus leading to the decrease of molecular weight and the rise of hydroxyl groups. The influence of reaction temperature and time was also examined in view of some key structural parameters. Experimental evidences from model compounds confirmed that the repolymerization occurs with the depolymerization of lignin, which may account for the low production of monomeric products during DES treatment.https://www.frontiersin.org/article/10.3389/fenrg.2020.00048/fulllignindeep eutectic solvents (DESs)β-O-4 mimicsrepolymerizationdepolymerization |
| spellingShingle | Shuizhong Wang Helong Li Ling-Ping Xiao Ling-Ping Xiao Guoyong Song Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment Frontiers in Energy Research lignin deep eutectic solvents (DESs) β-O-4 mimics repolymerization depolymerization |
| title | Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment |
| title_full | Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment |
| title_fullStr | Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment |
| title_full_unstemmed | Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment |
| title_short | Unraveling the Structural Transformation of Wood Lignin During Deep Eutectic Solvent Treatment |
| title_sort | unraveling the structural transformation of wood lignin during deep eutectic solvent treatment |
| topic | lignin deep eutectic solvents (DESs) β-O-4 mimics repolymerization depolymerization |
| url | https://www.frontiersin.org/article/10.3389/fenrg.2020.00048/full |
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