Document Detail

Composition of suberin extracted upon gradual alkaline methanolysis of Quercus suber L. cork.
MedLine Citation:
PMID:  10691644     Owner:  NLM     Status:  MEDLINE    
The monomeric composition of suberin extracts obtained by gradual alkaline methanolysis of Quercus suber cork was determined by gas chromatography-mass spectrometry (GC-MS). Results show that 1-alkanols and alkanoic and alpha,omega-alkanedioic acids are preferentially removed upon mild alkaline conditions, whereas mid-chain-modified omega-hydroxyalkanoic acids are preferentially removed under stronger alkaline conditions. Saturated omega-hydroxyalkanoic acids are found to be abundant in all suberin extracts. These results are consistent with two distinct suberin fractions with different locations in cork cell walls and/or esterification degrees. It is proposed that these fractions correlate with the two main suberin peaks in the solid state (13)C NMR spectra of cork and suberin extracts. Quantitative GC-MS analysis showed that suberin monomers comprise approximately 30% (w/w) of the suberin extracts, the remaining comprising nonvolatile structures with high M(n) values, as measured by vapor pressure osmometry. The presence of a large fraction of high molecular weight aliphatic structures in suberin extracts is supported by the corresponding NMR spectra.
M H Lopes; A M Gil; A J Silvestre; C P Neto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  48     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-04-24     Completed Date:  2000-04-24     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  383-91     Citation Subset:  IM    
Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
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MeSH Terms
Gas Chromatography-Mass Spectrometry
Hydrogen-Ion Concentration
Magnetic Resonance Spectroscopy
Membrane Lipids / chemistry*
Trees / chemistry*
Reg. No./Substance:
0/Lipids; 0/Membrane Lipids; 74-82-8/Methane; 8072-95-5/suberin

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