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Characterization of Lignin Structures and Lignin–Carbohydrate Complex (LCC) Linkages by Quantitative 13C and 2D HSQC NMR Spectroscopy

Yuan, Tong-Qi, Sun, Shao-Ni, Xu, Feng, Sun, Run-Cang·2011·Journal of Agricultural and Food Chemistry
DOI 10.1021/jf2031549
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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.

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Metadata

Authors
Yuan, T.-Q., Sun, S.-N., Xu, F., & Sun, R.-C.
Venue
Journal of Agricultural and Food Chemistry
Publisher
American Chemical Society (ACS)
Published
2011-09-15
Volume
59
Issue
19
Pages
10604-10614
ISSN
  • 0021-8561 (ISSN-L)
  • 1520-5118
DOI
10.1021/jf2031549
OpenAlex
W2318832362
Cited by
636
References
1
FWCI
8.93
Type
journal article
Language
en
Open access
closed

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