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Isolation and structural characterization of the milled wood lignin from Paulownia fortunei wood

AuthorsRencoret, Jorge ; Marques, Gisela ; Gutiérrez Suárez, Ana ; Nieto, Lidia ; Jiménez-Barbero, Jesús ; Martínez, Ángel T. ; Río Andrade, José Carlos del
KeywordsPaulownia fortunei
Milled-wood lignin (MWL)
Issue Date2009
CitationIndustrial Crops and Products 30(1): 137-143 (2009)
AbstractThe chemical structure of the milled-wood lignin isolated from Paulownia fortunei wood was investigated. The lignins were characterized by analytical pyrolysis and two-dimensional NMR that indicated a predominance of guaiacyl (G) over syringyl (S) units, and only showed small amounts of p-hydroxyphenyl (H) units, with a H:G:S molar ratio of 1:59:40. The heteronuclear single quantum correlation (HSQC) NMR spectrum gave additional information about the relative abundances of the different inter-unit linkages present in the lignin structure. Paulownia lignin showed a predominance of β-O-4' aryl ether linkages (62% of total side-chains), followed by β-β' resinol-type (12%) and β-5' phenylcoumaran-type structures (11%) and with lower amounts of other condensed structures such as spirodienone (3%) and dibenzodioxocin (2%) structures. The high lignin content (ca. 23% Klason lignin), together with the low S/G ratio and the abundance of condensed (carbon-carbon linked) structures (together with the low abundance of the most labile ether-linked structures) could contribute to the low reactivity of paulownia lignin during alkaline pulping.
Description7 páginas, 3 figuras, 3 tablas.
Publisher version (URL)http://dx.doi.org/10.1016/j.indcrop.2009.03.004
Appears in Collections:(IRNAS) Artículos
(CIB) Artículos
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