| Composition of suberin extracted upon gradual alkaline methanolysis of Quercus suber L. cork. | |
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MedLine Citation:
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PMID: 10691644 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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M H Lopes; A M Gil; A J Silvestre; C P Neto |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: 48 ISSN: 0021-8561 ISO Abbreviation: J. Agric. Food Chem. Publication Date: 2000 Feb |
Date Detail:
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Created Date: 2000-04-24 Completed Date: 2000-04-24 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 383-91 Citation Subset: IM |
Affiliation:
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Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Gas Chromatography-Mass Spectrometry Hydrogen-Ion Concentration Lipids Magnetic Resonance Spectroscopy Membrane Lipids / chemistry* Methane Trees / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Lipids; 0/Membrane Lipids; 74-82-8/Methane; 8072-95-5/suberin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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