<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>7</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Miranda, Ana M</style></author><author><style face="normal" font="default" size="100%">Reis Machado, Ana S</style></author><author><style face="normal" font="default" size="100%">Pereira, Helena</style></author><author><style face="normal" font="default" size="100%">Nunes da Ponte, Manuel</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Proceedings, Ph. Rudolf von Rohr</style></author><author><style face="normal" font="default" size="100%">Technology, Ch. Trepp B T - Process</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">High - pressure extraction of cork with CO2 and 1,4-dioxane</style></title><secondary-title><style face="normal" font="default" size="100%">High Pressure Chemical Engineering Proceedings of the 3rd International Symposium on High Pressure Chemical Engineering</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">1</style></keyword><keyword><style  face="normal" font="default" size="100%">4-Dioxane</style></keyword><keyword><style  face="normal" font="default" size="100%">Cork</style></keyword><keyword><style  face="normal" font="default" size="100%">high-pressure extraction</style></keyword><keyword><style  face="normal" font="default" size="100%">suberin</style></keyword><keyword><style  face="normal" font="default" size="100%">supercritical CO2</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1996</style></year></dates><publisher><style face="normal" font="default" size="100%">Elsevier</style></publisher><volume><style face="normal" font="default" size="100%">Volume 12</style></volume><pages><style face="normal" font="default" size="100%">417-422</style></pages><isbn><style face="normal" font="default" size="100%">0921-8610</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The extraction of cork from cork-oak (Quercus suber L.) by high-pressure dioxane and supercritical CO2 mixtures was studied at 170 bar and in the temperature range of 160°C - 180°C. Suberin is preferably extracted, but extraction percentages were lower than 46%. Lignin extraction percentages are lower than 11%. Extraction selectivity did not change significantly with extracting fluid composition. The results so far obtained support the idea of the existence of an extensive polymeric system across the cell wall and the concept of a close interaction of suberin and lignin, which hinders lignin depolymerization and solubilization in the high-pressure fluid. Fourier transform infrared spectra of cork, extraction residues and extracts are also presented.</style></abstract></record></records></xml>