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Lignin structure from Cynara cardunculus in comparison with other herbaceous species

AuthorsLourenço, Ana; Rencoret, Jorge ; Chemetova, C.; Gominho, J.; Gutiérrez Suárez, Ana ; Pereira, Helena; Río Andrade, José Carlos del
KeywordsCynara cardunculus
Lignin isolation
Issue Date28-Jun-2016
PublisherInternational Union of Forest Research Organizations
Citation14th European Workshop on Lignocellulosics and Pulp June 28-30, 2016 - Autrans, France.
AbstractCardoon lignin was isolated by the Björkman method and its composition and structure were studied by Py-GC/MS, 2D-NMR and DFRC. Cardoon lignin has more guaiacyl (G) than syringyl (S) units (S/G 0.7), and no p-hydroxyphenyl (H) units. The linkages are predominantly of ß¿O¿4¿ alkyl-aryl ether type (70% of all inter-unit linkages), but some condensed linkages such as ß-5¿ phenylcoumarans (14%), ß-ß¿ resinols (7%), ß-1¿ spirodienones (5%) and 5-5¿ dibenzodioxocins (4%) are also present. Lignin is partially acylated at the ¿-OH (12% acylation) by acetate groups, preferentially on syringyl-units. Cardoon lignin is structurally similar to wheat straw lignin, but different from sisal, jute and Mmiscanthus lignins regarding acylation type and degree.
Identifiersisbn: 979-10-90188-02-0
Appears in Collections:(IRNAS) Libros y partes de libros
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