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Closed Access item Structural characterization of guaiacyl-rich lignins in flax (Linum usitatissimum) fibers and shives

Authors:Río Andrade, José Carlos del
Rencoret, Jorge
Gutiérrez Suárez, Ana
Nieto Garrido, Lidia
Jiménez-Barbero, Jesús
Martínez Ferrer, Ángel Tomás
Keywords:flax, Linum usitatissimum, fibers, shives, Py-GC/MS, HSQC, thioacidolysis, milled wood lignin
Issue Date:26-Oct-2011
Publisher:American Chemical Society
Citation:Journal of Agricultural and Food Chemistry 59(20): 11088-11099(2011)
Abstract: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
Description:11 páginas, 6 figuras, 6 tablas -- PAGS nros. 11088-11099
Publisher version (URL):http://dx.doi.org/10.1021/jf201222r
E-ISSNmetadata.dc.identifier.doi = DOI:1520-5118
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