Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 59, Issue 20, Pages 11088-11099Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf201222r
Keywords
flax; Linum usitatissimum; fibers; shives; Py-GC/MS; HSQC; thioacidolysis; milled wood lignin
Funding
- Spanish Project [AGL2008-00709]
- CSIC [2006401039, 201040E075]
- EU [NMP2-CT-2006-026456]
- LIGNO-DECO [KBBE-244362]
- Spanish CSIC
- Spanish Ministry of Education
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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 beta-O-4' aryl ether linkages, followed by beta-5' phenylcoumaran and beta-beta' 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 beta-5' followed by beta-1' and 5-5' structures.
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