Isolation of suberin from birch outer bark and cork using ionic liquids: A new source of macromonomers

authors	Ferreira, R; Garcia, H; Sousa, AF; Freire, CSR; Silvestre, AJD; Rebelo, LPN; Pereira, CS
nationality	International
journal	INDUSTRIAL CROPS AND PRODUCTS
author keywords	Suberin; Cork; Birch outer bark; Cholinium hexanoate ionic liquids
keywords	NUCLEAR-MAGNETIC-RESONANCE; SOLID-STATE C-13-NMR; QUERCUS-SUBER; THERMOGRAVIMETRIC ANALYSIS; THERMAL-DECOMPOSITION; L. CORK; METHANOLYSIS; POLYESTER; GLYCERYL; MONOMERS
abstract	Cholinium hexanoate, a biocompatible and biodegradable ionic liquid, was recently demonstrated to efficiently and selectively extract suberin domains from cork, combining high extraction efficiency with isolation of a partial depolymerised material. In the present paper, we report a comparative study of the characterisation of suberin extracted from birch outer bark and from cork using cholinium hexanoate. It became apparent that both extracted suberin samples showed still a cross-linked nature, i.e. likely to be closely related to in situ suberin. Suberin samples were mainly constituted by oligomeric or polymeric structures in turn essentially composed by long chain hydroxyacids monomers. Their high thermal stability together with the oligomeric/polymeric nature, open new perspectives for suberin use as macromonomers in the development of bio-based polymeric materials. This also contributes for the valorisation of suberin rich agro-forest residues. (C) 2012 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	0926-6690
year published	2013
volume	44
beginning page	520
ending page	527
digital object identifier (doi)	10.1016/j.indcrop.2012.10.002
web of science category	Agricultural Engineering; Agronomy
subject category	Agriculture
unique article identifier	WOS:000315659400073