Supercritical fluid extraction from Lippia alba: global yields, kinetic data, and extract chemical composition

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorBraga, MEM
dc.creatorEhlert, PAD
dc.creatorMing, Lin Chau
dc.creatorMeireles, MAA
dc.date2014-05-20T13:19:48Z
dc.date2016-10-25T16:41:23Z
dc.date2014-05-20T13:19:48Z
dc.date2016-10-25T16:41:23Z
dc.date2005-06-01
dc.date.accessioned2017-04-05T19:46:24Z
dc.date.available2017-04-05T19:46:24Z
dc.identifierJournal of Supercritical Fluids. Amsterdam: Elsevier B.V., v. 34, n. 2, p. 149-156, 2005.
dc.identifier0896-8446
dc.identifierhttp://hdl.handle.net/11449/5323
dc.identifierhttp://acervodigital.unesp.br/handle/11449/5323
dc.identifier10.1016/j.supflu.2004.11.008
dc.identifierWOS:000228817800007
dc.identifierhttp://dx.doi.org/10.1016/j.supflu.2004.11.008
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/854441
dc.descriptionIn this work, experimental data for the system Lippia alba + CO2 is presented. The major constituents of the L. alba volatile oil are limonene and carvone. Thus, literature data for the systems limonene + CO2 and carvone + CO2, and the Peng-Robinson equation of state (PR-EOS) were used to select the operating temperature and pressure, which maximize the global yield in L. alba extract. Global yields were determined at 80, 100, and 120 bar and 40, 45, and 50 degrees C. L. alba extracts were also obtained by conventional processes (hydrodistillation, low-pressure ethanol extraction and Soxhlet ethanol). The chemical compositions of the extracts were determined by gas and thin layer chromatography (TLC). The secretor structures of L. alba were observed by scanning electron microscopy (SEM) before and after supercritical extraction. The largest yield (similar to 7%, mass of extract/mass of dry solid) of the CO2-extract was obtained at 318 K and 100 bar. The chemical compositions of the CO2-extracts were different from those of the extracts obtained by Soxhlet and low-pressure solvent extraction (LPSE) because of the co-extraction of heavy substances by ethanol. The operating conditions that maximized the carvone and limomene yields were 80 bar and 323 K (80 mass%) and 120 bar and 323 K (17 mass%), respectively. (c) 2004 Elsevier B.V All rights reserved.
dc.languageeng
dc.publisherElsevier B.V.
dc.relationJournal of Supercritical Fluids
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectcarvone
dc.subjectextraction kinetics
dc.subjectphase equilibrium
dc.subjectlimonene
dc.subjectLippia alba
dc.subjectsupercritical fluid extraction
dc.titleSupercritical fluid extraction from Lippia alba: global yields, kinetic data, and extract chemical composition
dc.typeOtro


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