The organosolv fractionation of cork components
authors Cordeiro, N; Neto, CP; Rocha, J; Belgacem, MN; Gandini, A
nationality International
journal HOLZFORSCHUNG
author keywords cork; Quercus suber L; organosolv fractionation; ethanol/water extraction; suberin; FTIR; C-13 NMR
keywords NUCLEAR-MAGNETIC-RESONANCE; QUERCUS-SUBER L; CELL-WALL; CHEMICALS; POLYURETHANES; URETHANES; LIGNIN
abstract Extractive-free cork from Quercus suber L. was submitted to organosolv fractionation and the effects of different process variables, such as ethanol/water ratio, temperature, time and the presence of acidic or alkaline catalysts, were studied. The variation of the relative proportions of extracted components, as a function of the processing conditions, could thus be established. Whereas the addition of 0.1 M acetic acid only increased the yield of extracted materials from about 15 to 23 %, the use of sodium hydroxide, at the same concentration, produced a jump to 76 %. In the case of the alkaline organosolv fractionation. an increase in process temperature, time and catalyst concentration led to an increase in the extraction yield, although in some cases this increase did not follow a sustained trend, as in the case of reaction time. Increasing the ethanol/water ratio led to a higher selectivity in favour of suberin extraction. Residual cork from different organosolv processes was characterised by FTIR and C-13 solid-state NMR. The latter technique provided some valuable information about both process selectivity and cork morphology, particularly with respect to the positioning of suberin macromolecules in the cell wall.
publisher WALTER DE GRUYTER & CO
issn 0018-3830
year published 2002
volume 56
issue 2
beginning page 135
ending page 142
digital object identifier (doi) 10.1515/HF.2002.023
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:000174983200005
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 1.826
5 year journal impact factor 1.828
category normalized journal impact factor percentile 74.387
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg