Structural features of macromolecular components of cork from Quercus suber L.
authors Branco, DG; Campos, JR; Cabrita, L; Evtuguin, DV
nationality International
journal HOLZFORSCHUNG
author keywords cork; cork cellulose; cork lignin; Quercus suber L.; suberin
keywords CHEMICAL-COMPOSITION; REPRODUCTION CORK; LIGNIN; VARIABILITY
abstract The structural features of macromolecular components of cork (suberin, lignin, cellulose and hemicelluloses) from Quercus suber L. used for the production of stoppers were assessed after their isolation and purification. Suberin is the major component of cork (ca. 44%) and is constituted mainly by hydroxy fatty acids (C-14-C-26). Cork lignin was found to be highly condensed (16.2%) and revealed a syringyl:guaiacyl:p-hydroxyphenyl (S:G:H) ratio of 26:71:3 with predominant beta-O-4' (0.38%), beta-5', beta-beta and tetrahydrofuran (THF) type (totally ca. 27%) structures. Cork lignin also has a remarkable amount of ferulic acid structures, which are considered the binding point between lignin and suberin. The cellulose of cork cells (17.2%) is a typical cellulose I polymorph with a degree of crystallinity (DC) of 70.3% and an average crystallite width of 3.5 nm. The major hemicellulose of cork is glucuronoxylan (near 6.0%) possessing a molar Xylp:MeGlcpA ratio of 14:1.
publisher WALTER DE GRUYTER GMBH
issn 0018-3830
year published 2020
volume 74
issue 6
beginning page 625
ending page 633
digital object identifier (doi) 10.1515/hf-2019-0271
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:000541917500010
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