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Título

Structural characterization of lignin isolated from coconut (Cocos nucifera) coir fibers

AutorRencoret, Jorge CSIC ORCID; Ralph, John; Marques, Gisela CSIC ORCID; Gutiérrez Suárez, Ana CSIC ORCID ; Martínez, Ángel T. CSIC ORCID ; Río Andrade, José Carlos del CSIC ORCID
Palabras claveCoconut
Coir
Lignin
Py-GC/MS
TMAH
HSQC
DFRC
Thioacidolysis
P-hydroxybenzoates
Tricin
Fecha de publicación2013
EditorAmerican Chemical Society
CitaciónJournal of Agricultural and Food Chemistry 61: 2434-2445 (2013)
ResumenThe structure of the isolated milled “wood” lignin from coconut coir has been characterized using different analytical methods, including Py-GC/MS, 2D NMR, DFRC, and thioacidolysis. The analyses demonstrated that it is a phydroxyphenyl-guaiacyl-syringyl (H-G-S) lignin, with a predominance of G units (S/G ratio 0.23) and considerable amounts of associated p-hydroxybenzoates. Two-dimensional NMR indicated that the main substructures present in this lignin include β−O−4′ alkyl aryl ethers followed by phenylcoumarans and resinols. Two-dimensional NMR spectra also indicated that coir lignin is partially acylated at the γ-carbon of the side chain with p-hydroxybenzoates and acetates. DFRC analysis showed that acetates preferentially acylate the γ−OH in S rather than in G units. Despite coir lignin’s being highly enriched in G-units, thioacidolysis indicated that β−β′ resinol structures are mostly derived from sinapyl alcohol. Finally, we find evidence that the flavone tricin is incorporated into the coconut coir lignin, as has been recently noted for various grasses.
Descripción12 pages, 6 figures, 7 tables, 60 references. †Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, PO Box 1052, E-41080 Seville, Spain ‡Departments of Biochemistry and Biological Systems Engineering, the Wisconsin Energy Institute, and the DOE Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, Wisconsin 53726, United States §Centro de Investigaciones Biológicas (CIB), CSIC, Ramiro de Maeztu 9, E-28040 Madrid, Spain
Versión del editorhttp://dx.doi.org/10.1021/jf304686x
URIhttp://hdl.handle.net/10261/72136
DOI10.1021/jf304686x
ISSN0021-8561
E-ISSN1520-5118
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