<?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></contributors><titles><title><style face="normal" font="default" size="100%">Extractives of cork (Quercus suber L.): chemical composition of dichloromethane and supercritical CO2 extracts</style></title><secondary-title><style face="normal" font="default" size="100%">Industrial Crops and Products</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2005</style></year></dates><volume><style face="normal" font="default" size="100%">21</style></volume><pages><style face="normal" font="default" size="100%">65-69</style></pages><isbn><style face="normal" font="default" size="100%">3349552412</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The polymeric matrix of the cork is mainly composed of suberin, lignin and polysaccharides and contains also extractives. Typical components of the extracted mixtures are triterpenes belonging to friedelane, lupane and steroid families and long chain alkanes and alkanols. Two extractive methods have been used, the conventional extraction with a solvent (SE) using dichloromethane (DCM) and the innovative method which uses as solvent supercritical CO2 (SFE) at moderate pressures (200–250 bar). Identiﬁcation and quantitation of the individual triterpenoids and steroids present in the extracts have been carried out by means of the computer aided 13 C NMR analysis without previous separation. Friedelin was found as the main component of the extracts. The main difference between the two extracts concerned the contents of sitost-4-en-3-one which represented 15% of the CO2 extract against 3% in the DCM extract. Similarly, -sitosterol was found in CO2 extract (3%) but not in DCM extract.</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%">Castola, Vincent</style></author><author><style face="normal" font="default" size="100%">Marongiu, Bruno</style></author><author><style face="normal" font="default" size="100%">Bighelli, Ange</style></author><author><style face="normal" font="default" size="100%">Floris, Constantino</style></author><author><style face="normal" font="default" size="100%">Laı̈, Adolfo</style></author><author><style face="normal" font="default" size="100%">Casanova, Joseph</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Extractives of cork (Quercus suber L.): chemical composition of dichloromethane and supercritical CO2 extracts</style></title><secondary-title><style face="normal" font="default" size="100%">Industrial Crops and Products</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">13 c nmr</style></keyword><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">supercritical extraction</style></keyword><keyword><style  face="normal" font="default" size="100%">triterpenes</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2005</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2005///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://linkinghub.elsevier.com/retrieve/pii/S0926669003001523</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">21</style></volume><pages><style face="normal" font="default" size="100%">65 - 69</style></pages><isbn><style face="normal" font="default" size="100%">3349552412</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The polymeric matrix of the cork is mainly composed of suberin, lignin and polysaccharides and contains also extractives. Typical components of the extracted mixtures are triterpenes belonging to friedelane, lupane and steroid families and long chain alkanes and alkanols. Two extractive methods have been used, the conventional extraction with a solvent (SE) using dichloromethane (DCM) and the innovative method which uses as solvent supercritical CO2 (SFE) at moderate pressures (200–250 bar). Identiﬁcation and quantitation of the individual triterpenoids and steroids present in the extracts have been carried out by means of the computer aided 13 C NMR analysis without previous separation. Friedelin was found as the main component of the extracts. The main difference between the two extracts concerned the contents of sitost-4-en-3-one which represented 15% of the CO2 extract against 3% in the DCM extract. Similarly, -sitosterol was found in CO2 extract (3%) but not in DCM extract.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue></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%">Castola, Vincent</style></author><author><style face="normal" font="default" size="100%">Bighelli, Ange</style></author><author><style face="normal" font="default" size="100%">Rezzi, Serge</style></author><author><style face="normal" font="default" size="100%">Melloni, Giovanni</style></author><author><style face="normal" font="default" size="100%">Gladiali, Serafino</style></author><author><style face="normal" font="default" size="100%">Desjobert, Jean-Marie</style></author><author><style face="normal" font="default" size="100%">Casanova, Joseph</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Composition and chemical variability of the triterpene fraction of dichloromethane extracts of cork (Quercus suber L.)</style></title><secondary-title><style face="normal" font="default" size="100%">Industrial Crops and Products</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">13C NMR</style></keyword><keyword><style  face="normal" font="default" size="100%">Chemical variability</style></keyword><keyword><style  face="normal" font="default" size="100%">Chemometric analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">extracts</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2002</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2002///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://linkinghub.elsevier.com/retrieve/pii/S0926669001000917</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">15</style></volume><pages><style face="normal" font="default" size="100%">15 - 22</style></pages><isbn><style face="normal" font="default" size="100%">3349552412</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Dichloromethane extracts were prepared from 38 samples of cork harvested in different locations of Corsica and Sardinia from individual trees of Quercus suber L. Friedelin, 3--hydroxyfriedelan-2-one, betulin, betulinic acid, -sitosterol and sitost-4-en-3-one were identiﬁed and their molar percentages were calculated by 13 C NMR spectroscopy, following a procedure recently developed by our group. The results were submitted to chemometric analysis (k-means and principal component analysis), which allowed three groups to be distinguished with respect to the content of friedelin, betulinic acid and 3--hydroxyfriedelan-2-one.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors></contributors><titles><title><style face="normal" font="default" size="100%">Composition and chemical variability of the triterpene fraction of dichloromethane extracts of cork (Quercus suber L.)</style></title><secondary-title><style face="normal" font="default" size="100%">Industrial Crops and Products</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2002</style></year></dates><volume><style face="normal" font="default" size="100%">15</style></volume><pages><style face="normal" font="default" size="100%">15-22</style></pages><isbn><style face="normal" font="default" size="100%">3349552412</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Dichloromethane extracts were prepared from 38 samples of cork harvested in different locations of Corsica and Sardinia from individual trees of Quercus suber L. Friedelin, 3--hydroxyfriedelan-2-one, betulin, betulinic acid, -sitosterol and sitost-4-en-3-one were identiﬁed and their molar percentages were calculated by 13 C NMR spectroscopy, following a procedure recently developed by our group. The results were submitted to chemometric analysis (k-means and principal component analysis), which allowed three groups to be distinguished with respect to the content of friedelin, betulinic acid and 3--hydroxyfriedelan-2-one.</style></abstract></record></records></xml>