Composition of suberin extracted upon gradual alkaline methanolysis of Quercus suber L. cork
authors Lopes, MH; Gil, AM; Silvestre, AJD; Neto, CP
journal JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
author keywords suberin; cork; Quercus suber L.; GC-MS; NMR; alkaline methanolysis
keywords CHEMICAL CHARACTERIZATION; POLYESTER; PLANTS
abstract 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 l-alkanols and alkanoic and a,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 w-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 C-13 NMR spectra of cork and suberin extracts. Quantitative CC-MS analysis showed that suberin monomers comprise similar to 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.
publisher AMER CHEMICAL SOC
issn 0021-8561
year published 2000
volume 48
issue 2
beginning page 383
ending page 391
digital object identifier (doi) 10.1021/jf9909398
web of science category Agriculture, Multidisciplinary; Chemistry, Applied; Food Science & Technology
subject category Agriculture; Chemistry; Food Science & Technology
unique article identifier WOS:000085510000042
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.192
5 year journal impact factor 4.289
category normalized journal impact factor percentile 86.265
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg