Extraction Of Phenolic Compounds From Pitanga (eugenia Uniflora L.) Leaves By Sequential Extraction In Fixed Bed Extractor Using Supercritical Co 2, Ethanol And Water As Solvents

dc.creatorGarmus T.T.
dc.creatorPaviani L.C.
dc.creatorQueiroga C.L.
dc.creatorMagalhaes P.M.
dc.creatorCabral F.A.
dc.date2014
dc.date2015-06-25T17:49:40Z
dc.date2015-11-26T15:24:29Z
dc.date2015-06-25T17:49:40Z
dc.date2015-11-26T15:24:29Z
dc.date.accessioned2018-03-28T22:33:24Z
dc.date.available2018-03-28T22:33:24Z
dc.identifier
dc.identifierJournal Of Supercritical Fluids. , v. 86, n. , p. 4 - 14, 2014.
dc.identifier8968446
dc.identifier10.1016/j.supflu.2013.11.014
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84891111248&partnerID=40&md5=94e957629a159d20cc55b01b360962a7
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/85690
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/85690
dc.identifier2-s2.0-84891111248
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1260709
dc.descriptionWith the goal of maximizing the extraction yield of phenolic compounds from pitanga leaves (Eugenia uniflora L.), a sequential extraction in fixed bed was carried out in three steps at 60 C and 400 bar, using supercritical CO 2 (non-polar) as solvent in a first step, followed by ethanol (polarity: 5.2) and water (polarity: 9.0) in a second and third steps, respectively. All extracts were evaluated for global extraction yield, concentration and yield of both polyphenols and total flavonoids and antioxidant activity by DPPH method (in terms of EC50). The nature of the solvent significantly influenced the process, since the extraction yield increased with solvent polarity. The aqueous extracts presented higher global extraction yield (22%), followed by ethanolic (16%) and supercritical extracts (5%). The study pointed out that the sequential extraction process is the most effective in terms of global extraction yield and yield of polyphenols and total flavonoids, because it produced the more concentrated extracts on phenolic compounds, since the supercritical ethanolic extract presented the highest phenolics content (240.5 mg GAE/g extract) and antioxidant capacity (EC 50 = 9.15 μg/mL). The most volatile fraction from the supercritical extract, which is similar to the essential oils obtained by steam distillation or hydrodistillation, presented as major compounds the germacrenos D and B + bicyclogermacrene (40.75%), selina-1,3,7(11)-trien-8-one + selina-1,3,7(11)-trien-8-one epoxide (27.7%) and trans-caryophyllene (14.18%). © 2013 Elsevier B.V.
dc.description86
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dc.languageen
dc.publisher
dc.relationJournal of Supercritical Fluids
dc.rightsfechado
dc.sourceScopus
dc.titleExtraction Of Phenolic Compounds From Pitanga (eugenia Uniflora L.) Leaves By Sequential Extraction In Fixed Bed Extractor Using Supercritical Co 2, Ethanol And Water As Solvents
dc.typeArtículos de revistas


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