Green extraction of high added value substances from spent coffee grounds: preliminary results
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.21/8552 |
Resumo: | A 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. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Green extraction of high added value substances from spent coffee grounds: preliminary resultsAntioxidantsSpent coffee groundSupercritical CO2 extractionTriacylglycerolsA 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.Journal of Chemical Technology and MetallurgyRCIPLGeorgieva, Sílvia S.Coelho, JoseCampos, Filipe C.Robalo, Maria PaulaStateva, Roumiana P.2018-06-04T09:51:35Z20182018-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/8552engGEORGIEVA, 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. 640-6461314-7471metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T09:56:07Zoai:repositorio.ipl.pt:10400.21/8552Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:17:17.869545Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
title |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
spellingShingle |
Green extraction of high added value substances from spent coffee grounds: preliminary results Georgieva, Sílvia S. Antioxidants Spent coffee ground Supercritical CO2 extraction Triacylglycerols |
title_short |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
title_full |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
title_fullStr |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
title_full_unstemmed |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
title_sort |
Green extraction of high added value substances from spent coffee grounds: preliminary results |
author |
Georgieva, Sílvia S. |
author_facet |
Georgieva, Sílvia S. Coelho, Jose Campos, Filipe C. Robalo, Maria Paula Stateva, Roumiana P. |
author_role |
author |
author2 |
Coelho, Jose Campos, Filipe C. Robalo, Maria Paula Stateva, Roumiana P. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Georgieva, Sílvia S. Coelho, Jose Campos, Filipe C. Robalo, Maria Paula Stateva, Roumiana P. |
dc.subject.por.fl_str_mv |
Antioxidants Spent coffee ground Supercritical CO2 extraction Triacylglycerols |
topic |
Antioxidants Spent coffee ground Supercritical CO2 extraction Triacylglycerols |
description |
A 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. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-06-04T09:51:35Z 2018 2018-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.21/8552 |
url |
http://hdl.handle.net/10400.21/8552 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
GEORGIEVA, 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. 640-646 1314-7471 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
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metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Journal of Chemical Technology and Metallurgy |
publisher.none.fl_str_mv |
Journal of Chemical Technology and Metallurgy |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133434288799744 |