Structural Characterization of Guaiacyl-rich Lignins in Flax (Linum usitatissimum) Fibers and Shives

The structural characteristics of the lignins from flax (Linum usitatissimum) fibers and shives were studied. Significant differences in the content and composition of the lignin from both parts were observed. The lignin contents were 3.8% in the fibers and 29.0% in the shives. Analysis by Py-GC/MS indicated a H:G:S molar ratio of 13:72:15 in the milled wood lignin (MWL) isolated from flax fibers and a molar ratio of 5:87:8 in the MWL isolated from flax shives. In addition, 2D-NMR showed a predominance of β-O-4 aryl ether linkages, followed by β-5 phenylcoumaran and β-β resinol-type linkages in both MWLs, with a higher content of condensed linkages in flax shives. Thioacidolysis (followed by Raney nickel desulfurization) gave further information on the lignin units involved in the different linkages and confirmed the enrichment of G units. The thioacidolysis dimers released were similar from both lignins, with a predominance of the β-5 followed by β-1 and 5-5 structures.

Bibliographic Details

Main Authors:	Río Andrade, José Carlos del, Rencoret, Jorge, Gutiérrez Suárez, Ana, Nieto, Lidia, Jiménez-Barbero, Jesús, Martínez, Ángel T.
Other Authors:	Consejo Superior de Investigaciones Científicas (España)
Format:	artículo biblioteca
Language:	English
Published:	American Chemical Society 2011-09-09
Subjects:	Flax, Linum usitatissimum, Fibers, Shives, Py-GC/MS, HSQC, Thioacidolysis, Milled wood lignin,
Online Access:	http://hdl.handle.net/10261/85602 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780
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