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Green extraction of high added value substances from spent coffee grounds: preliminary results

2018Journal article Restricted access
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dc.contributor.authorGeorgieva, Sílvia S.
dc.contributor.authorCoelho, Jose
dc.contributor.authorCampos, Filipe C.
dc.contributor.authorRobalo, Maria Paula
dc.contributor.authorStateva, Roumiana P.
dc.date.accessioned2018-06-04T09:51:35Z
dc.date.available2018-06-04T09:51:35Z
dc.date.issued2018
dc.description.abstractA supercritical fluid extraction (SFE) with pure CO2 and ethanol as a co-solvent (10 %) of spent coffee grounds was carried out at temperatures from 313 K to 333 K, pressures up to 40.0 MPa and the results obtained were compared with those of the conventional Soxhlet method using n-hexane as a solvent. The best extraction yield (12.0 %) was achieved by SFE with CO2+10 % ethanol, compared to 9.5 - 10.7 % by SFE with pure CO2 and 10.4 % with n-hexane. The antioxidant potential was evaluated by DPPH method and the best antioxidant activity was exhibited by the spent coffee oil obtained by SFE, CO2+10 % ethanol. The quantification and the identification of the oils composition were carried out by NMR. The main constituents of the extracted oils referred to the triacylglycerols (TAGs, 98.9 - 96.8 %). Minor amounts of 1,2 diacylglycerols (1,2 DAGs, 2.7 - 0.68 %), and the diterpenes cafestol (6.02 - 2.26 %), 16-O-methylcafestol (4.86 - 2.00 %) and kahweol (2.11 - 0.71 %), as well as caffeine (1.45 - 0.1 %), were also present in all the extracts.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGEORGIEVA, Sílvia S.; [et al] – Green extraction of high added value substances from spent coffee grounds: preliminary results. Journal of Chemical Technology & Metallurgy. ISSN 1314-7471. Vol. 53, N.º 4, (2018), pp. 640-646pt_PT
dc.identifier.issn1314-7471
dc.identifier.urihttp://hdl.handle.net/10400.21/8552
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherJournal of Chemical Technology and Metallurgypt_PT
dc.relationUID/ QUI/00100/2013pt_PT
dc.relation.publisherversionhttp://web.a.ebscohost.com/ehost/pdfviewer/pdfviewer?vid=1&sid=28d3aa18-37a9-4777-9383-80b9bf4a133c%40sessionmgr4006pt_PT
dc.subjectAntioxidantspt_PT
dc.subjectSpent coffee groundpt_PT
dc.subjectSupercritical CO2 extractionpt_PT
dc.subjectTriacylglycerolspt_PT
dc.titleGreen extraction of high added value substances from spent coffee grounds: preliminary resultspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage646pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage640pt_PT
oaire.citation.titleJournal of Chemical Technology and Metallurgypt_PT
oaire.citation.volume53pt_PT
person.familyNameCoelho
person.familyNameRobalo
person.givenNameJose
person.givenNameMaria Paula
person.identifierR-000-84M
person.identifier.ciencia-idD716-31DF-8371
person.identifier.ciencia-idE11C-A704-9C18
person.identifier.orcid0000-0001-8118-0864
person.identifier.orcid0000-0002-8200-6910
person.identifier.ridG-2626-2011
person.identifier.ridB-2002-2012
person.identifier.scopus-author-id7101841005
person.identifier.scopus-author-id9269662100
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationec13b922-f442-44fa-bb07-7c2e0bebbe6d
relation.isAuthorOfPublication823a9498-17ab-451f-bb8f-56338643ac0c
relation.isAuthorOfPublication.latestForDiscovery823a9498-17ab-451f-bb8f-56338643ac0c

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