<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Evaristo, Isabel Maria</style></author><author><style face="normal" font="default" size="100%">Leitão, Maria Cecília</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Identificação e Quantificação por DAD-HPLC, da Fracção Fenólica Contida em Folhas de Quercus suber L.</style></title><secondary-title><style face="normal" font="default" size="100%">Silva Lusitana</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">avoir un rôle important</style></keyword><keyword><style  face="normal" font="default" size="100%">caffeic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">car ces</style></keyword><keyword><style  face="normal" font="default" size="100%">catechin</style></keyword><keyword><style  face="normal" font="default" size="100%">dans la présente étude</style></keyword><keyword><style  face="normal" font="default" size="100%">défense des</style></keyword><keyword><style  face="normal" font="default" size="100%">des feuilles de chêne</style></keyword><keyword><style  face="normal" font="default" size="100%">détermination des composés phénoliques</style></keyword><keyword><style  face="normal" font="default" size="100%">ferulic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">gallic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">liège</style></keyword><keyword><style  face="normal" font="default" size="100%">méthode analytique pour la</style></keyword><keyword><style  face="normal" font="default" size="100%">on a developpé une</style></keyword><keyword><style  face="normal" font="default" size="100%">p-coumaric acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus Suber L</style></keyword><keyword><style  face="normal" font="default" size="100%">résumé</style></keyword><keyword><style  face="normal" font="default" size="100%">substances sont susceptibles d</style></keyword><keyword><style  face="normal" font="default" size="100%">sur les mécanismes de</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2001///</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">135 - 141</style></pages><isbn><style face="normal" font="default" size="100%">0870-6352 UL - http://www.scielo.gpeari.mctes.pt/scielo.php?script=sci_arttext&amp;pid=S0870-63522001000200002&amp;nrm=iso</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In this study, an analytical method has been developed for the determination of phenolic compounds since they are related with disease and pests plant resistance mechanisms. The components of the hydrolysed extract (gallic acid, ellagic acid, catechin, epicatechin, caffeic acid, p-coumaric acid and ferulic acid) have been resolved and identified by DAD-HPLC based on their retention times and spectral data. For quantifications, the external standard method was used.</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: scielopt</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Evaristo, Isabel Maria</style></author><author><style face="normal" font="default" size="100%">Leitão, Maria Cecília</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Identificação e Quantificação por DAD-HPLC, da Fracção Fenólica Contida em Folhas de Quercus suber L.</style></title><secondary-title><style face="normal" font="default" size="100%">Silva Lusitana</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">avoir un rôle important</style></keyword><keyword><style  face="normal" font="default" size="100%">caffeic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">car ces</style></keyword><keyword><style  face="normal" font="default" size="100%">catechin</style></keyword><keyword><style  face="normal" font="default" size="100%">dans la présente étude</style></keyword><keyword><style  face="normal" font="default" size="100%">défense des</style></keyword><keyword><style  face="normal" font="default" size="100%">des feuilles de chêne</style></keyword><keyword><style  face="normal" font="default" size="100%">détermination des composés phénoliques</style></keyword><keyword><style  face="normal" font="default" size="100%">ferulic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">gallic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">liège</style></keyword><keyword><style  face="normal" font="default" size="100%">méthode analytique pour la</style></keyword><keyword><style  face="normal" font="default" size="100%">on a developpé une</style></keyword><keyword><style  face="normal" font="default" size="100%">p-coumaric acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus Suber L</style></keyword><keyword><style  face="normal" font="default" size="100%">résumé</style></keyword><keyword><style  face="normal" font="default" size="100%">substances sont susceptibles d</style></keyword><keyword><style  face="normal" font="default" size="100%">sur les mécanismes de</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><publisher><style face="normal" font="default" size="100%">scielopt</style></publisher><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">135-141</style></pages><isbn><style face="normal" font="default" size="100%">0870-6352 UL - http://www.scielo.gpeari.mctes.pt/scielo.php?script=sci_arttext&amp;pid=S0870-63522001000200002&amp;nrm=iso</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In this study, an analytical method has been developed for the determination of phenolic compounds since they are related with disease and pests plant resistance mechanisms. The components of the hydrolysed extract (gallic acid, ellagic acid, catechin, epicatechin, caffeic acid, p-coumaric acid and ferulic acid) have been resolved and identified by DAD-HPLC based on their retention times and spectral data. For quantifications, the external standard method was used.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Marques, A V</style></author><author><style face="normal" font="default" size="100%">Pereira, H</style></author><author><style face="normal" font="default" size="100%">Meier, D</style></author><author><style face="normal" font="default" size="100%">Faix, O</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Structural characterization of cork lignin by thioacidolysis and permanganate oxidation</style></title><secondary-title><style face="normal" font="default" size="100%">HOLZFORSCHUNG</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">cork lignin</style></keyword><keyword><style  face="normal" font="default" size="100%">ferulic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">milled wood lignin (MWL)</style></keyword><keyword><style  face="normal" font="default" size="100%">permanganate oxidation</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus suber</style></keyword><keyword><style  face="normal" font="default" size="100%">suberin</style></keyword><keyword><style  face="normal" font="default" size="100%">thioacidolysis</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><publisher><style face="normal" font="default" size="100%">WALTER DE GRUYTER &amp; CO</style></publisher><pub-location><style face="normal" font="default" size="100%">GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY</style></pub-location><volume><style face="normal" font="default" size="100%">53</style></volume><pages><style face="normal" font="default" size="100%">167-174</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Quercus suber L. milled cork lignins obtained from extractive-free cork (MCL) and from saponified cork (MCLsap) were characterized by thioacidolysis and KMnO4 oxidation. These techniques and the previously used analytical pyrolysis revealed that cork contains a guaiacyl lignin (G lignin) with 94-96% guaiacyl-, ca. 3% syringyl-, and 2-3% of 4-hydroxyphenyl propane units. The total yields of degradation products in thioacidolysis and KMnO4 oxidation experiments were lower in comparison to those of a spruce milled wood lignin (MWLspruce) suggesting a higher cross-linking in the G-lignin of cork. The higher frequency of ``condensed{''} structures (having C-C or C-O-C linkages to aromatic rings) in cork lignin was also manifested in the relative abundance of various aromatic acids obtained by KMnO4 oxidation. The cork lignin (MCLsap) contains only low amounts (ca. 2%) of covalently bonded suberinic acids. Numerous free aliphatic suberinic acids were detected and identified in the ether soluble part of MCLsap. Ferulic acid was not liberated by thioacidolysis, pointing at an in situ acylation. We suggest that the major part of the aromatic domain in cork is a G-lignin but that it includes also another structural moiety with higher H-unit content and linked by thioacidolysis resistant bonds.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Graça, José</style></author><author><style face="normal" font="default" size="100%">Pereira, Helena</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Feruloyl Esters of ω-Hydroxyacids in Cork Suberin</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Wood Chemistry and Technology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">ferulic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Feruloyl esters</style></keyword><keyword><style  face="normal" font="default" size="100%">GC-MS (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">suberin</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><publisher><style face="normal" font="default" size="100%">Taylor &amp; Francis</style></publisher><volume><style face="normal" font="default" size="100%">18</style></volume><pages><style face="normal" font="default" size="100%">207-217</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Feruloyl esters of ?-hydroxyacids were found in the alcoholysis products of suberin from Quercus suber cork. Their identification was made from mass spectra and by comparison with synthetic model compounds. The co-hydroxyls of suberinic hydroxyacids are thought to be the ester-bonding points between suberin aliphatics and associated aromatics.</style></abstract><notes><style face="normal" font="default" size="100%">doi: 10.1080/02773819809349577</style></notes><research-notes><style face="normal" font="default" size="100%">doi: 10.1080/02773819809349577</style></research-notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>3</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Graça, José</style></author><author><style face="normal" font="default" size="100%">Pereira, Helena</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Suberina: o polímero responsá vel pelas propriedades da cortiça</style></title><secondary-title><style face="normal" font="default" size="100%">II Congreso Forestal Español</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">ferulic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Glycerol</style></keyword><keyword><style  face="normal" font="default" size="100%">suberin</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><pub-location><style face="normal" font="default" size="100%">Pamplona</style></pub-location><pages><style face="normal" font="default" size="100%">225-228</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The macromolecular structure of suberin, the biopolymer mainly responsable for cork properties, is dicussed. The link of the suberinic aliphatic acids to glycerol is presented, supporting the hypothesis that suberin is a glyceridic polyester. The linkage of this aliphatic part, through ferulic acid, to the aromatic part, and the similarities of the later to lignin, are discussed. K.W.:</style></abstract></record></records></xml>