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Characterization of lignin structures and lignin-carbohydrate complex (LCC) linkages by quantitative 13C and 2D HSQC NMR spectroscopy.

Identifieur interne : 002F64 ( Main/Exploration ); précédent : 002F63; suivant : 002F65

Characterization of lignin structures and lignin-carbohydrate complex (LCC) linkages by quantitative 13C and 2D HSQC NMR spectroscopy.

Auteurs : Tong-Qi Yuan [République populaire de Chine] ; Shao-Ni Sun ; Feng Xu ; Run-Cang Sun

Source :

Journal of agricultural and food chemistry [ 1520-5118 ] ; 2011.

RBID : pubmed:21879769

Descripteurs français

KwdFr :
- Acylation (MeSH), Bois (composition chimique), Conformation des glucides (MeSH), Glucides (composition chimique), Lignine (composition chimique), Masse moléculaire (MeSH), Spectroscopie par résonance magnétique (MeSH), Structure moléculaire (MeSH).
MESH :
- composition chimique : Bois, Glucides, Lignine.
- Acylation, Conformation des glucides, Masse moléculaire, Spectroscopie par résonance magnétique, Structure moléculaire.

English descriptors

KwdEn :
- Acylation (MeSH), Carbohydrate Conformation (MeSH), Carbohydrates (chemistry), Lignin (chemistry), Magnetic Resonance Spectroscopy (MeSH), Molecular Structure (MeSH), Molecular Weight (MeSH), Wood (chemistry).
MESH :
- chemical , chemistry : Carbohydrates, Lignin.
- chemistry : Wood.
- Acylation, Carbohydrate Conformation, Magnetic Resonance Spectroscopy, Molecular Structure, Molecular Weight.

Abstract

To characterize the lignin structures and lignin-carbohydrate complex (LCC) linkages, milled wood lignin (MWL) and mild acidolysis lignin (MAL) with a high content of associated carbohydrates were sequentially isolated from ball-milled poplar wood. Quantification of their structural features has been achieved by using a combination of quantitative (13)C and 2D HSQC NMR techniques. The results showed that acetylated 4-O-methylgluconoxylan is the main carbohydrate associated with lignins, and acetyl groups frequently acylate the C2 and C3 positions. MWL and MAL exhibited similar structural features. The main substructures were β-O-4' aryl ether, resinol, and phenylcoumaran, and their abundances per 100 Ar units changed from 41.5 to 43.3, from 14.6 to 12.7, and from 3.7 to 4.0, respectively. The S/G ratios were estimated to be 1.57 and 1.62 for MWL and MAL, respectively. Phenyl glycoside and benzyl ether LCC linkages were clearly quantified, whereas the amount of γ-ester LCC linkages was ambiguous for quantification.

DOI: 10.1021/jf2031549
PubMed: 21879769

Affiliations:

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Le document en format XML

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<author><name sortKey="Sun, Run Cang" sort="Sun, Run Cang" uniqKey="Sun R" first="Run-Cang" last="Sun">Run-Cang Sun</name>
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<term>Lignin (chemistry)</term>
<term>Magnetic Resonance Spectroscopy (MeSH)</term>
<term>Molecular Structure (MeSH)</term>
<term>Molecular Weight (MeSH)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Acylation (MeSH)</term>
<term>Bois (composition chimique)</term>
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<term>Glucides (composition chimique)</term>
<term>Lignine (composition chimique)</term>
<term>Masse moléculaire (MeSH)</term>
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<term>Structure moléculaire (MeSH)</term>
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<front><div type="abstract" xml:lang="en">To characterize the lignin structures and lignin-carbohydrate complex (LCC) linkages, milled wood lignin (MWL) and mild acidolysis lignin (MAL) with a high content of associated carbohydrates were sequentially isolated from ball-milled poplar wood. Quantification of their structural features has been achieved by using a combination of quantitative (13)C and 2D HSQC NMR techniques. The results showed that acetylated 4-O-methylgluconoxylan is the main carbohydrate associated with lignins, and acetyl groups frequently acylate the C2 and C3 positions. MWL and MAL exhibited similar structural features. The main substructures were β-O-4' aryl ether, resinol, and phenylcoumaran, and their abundances per 100 Ar units changed from 41.5 to 43.3, from 14.6 to 12.7, and from 3.7 to 4.0, respectively. The S/G ratios were estimated to be 1.57 and 1.62 for MWL and MAL, respectively. Phenyl glycoside and benzyl ether LCC linkages were clearly quantified, whereas the amount of γ-ester LCC linkages was ambiguous for quantification.</div>
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<Abstract><AbstractText>To characterize the lignin structures and lignin-carbohydrate complex (LCC) linkages, milled wood lignin (MWL) and mild acidolysis lignin (MAL) with a high content of associated carbohydrates were sequentially isolated from ball-milled poplar wood. Quantification of their structural features has been achieved by using a combination of quantitative (13)C and 2D HSQC NMR techniques. The results showed that acetylated 4-O-methylgluconoxylan is the main carbohydrate associated with lignins, and acetyl groups frequently acylate the C2 and C3 positions. MWL and MAL exhibited similar structural features. The main substructures were β-O-4' aryl ether, resinol, and phenylcoumaran, and their abundances per 100 Ar units changed from 41.5 to 43.3, from 14.6 to 12.7, and from 3.7 to 4.0, respectively. The S/G ratios were estimated to be 1.57 and 1.62 for MWL and MAL, respectively. Phenyl glycoside and benzyl ether LCC linkages were clearly quantified, whereas the amount of γ-ester LCC linkages was ambiguous for quantification.</AbstractText>
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Characterization of lignin structures and lignin-carbohydrate complex (LCC) linkages by quantitative 13C and 2D HSQC NMR spectroscopy.

Characterization of lignin structures and lignin-carbohydrate complex (LCC) linkages by quantitative 13C and 2D HSQC NMR spectroscopy.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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