Characterization of Lignin Structures and Lignin–Carbohydrate Complex (LCC) Linkages by Quantitative 13C and 2D HSQC NMR Spectroscopy
In: Journal of Agricultural and Food Chemistry, Jg. 59 (2011-09-15), S. 10604-10614
Online
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Zugriff:
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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Characterization of Lignin Structures and Lignin–Carbohydrate Complex (LCC) Linkages by Quantitative 13C and 2D HSQC NMR Spectroscopy
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Autor/in / Beteiligte Person: | Xu, Feng ; Sun, Run-Cang ; Sun, Shao-Ni ; Yuan, Tong-Qi |
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Zeitschrift: | Journal of Agricultural and Food Chemistry, Jg. 59 (2011-09-15), S. 10604-10614 |
Veröffentlichung: | American Chemical Society (ACS), 2011 |
Medientyp: | unknown |
ISSN: | 1520-5118 (print) ; 0021-8561 (print) |
DOI: | 10.1021/jf2031549 |
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