Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts
Main Author: | |
---|---|
Publication Date: | 2020 |
Other Authors: | , , , , |
Format: | Article |
Language: | eng |
Source: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Download full: | http://hdl.handle.net/10400.21/11866 |
Summary: | Spent coffee grounds (SCGs) were extracted with supercritical CO2 at temperatures of 313 K and 333 K, pressures up to 50.0 MPa and different scCO(2) flow rates. The addition of co-solvents isopropanol, ethanol and ethyl lactate decreased the time to achieve the maximum oil yield, to half of that with pure CO2. Analysis of the extracted oils by NMR, showed that caffeine content was (0.56-3.96) % and DUFA and MUFA contents changed within (39.8-42.0) % and (12.9-15.8) %, respectively. The analyses of fatty acids performed by GC-FID revealed the composition of the oils being 76 % of the total constituted by palmitic and linoleic esters. The DPPH antioxidant capacity was improved up to 12.5 times with co-solvents. The kinetics of oil extraction from SCGs with pure scCO(2) was modeled successfully by combining for the first time representation of the oil mixture by a single virtual molecule with group contribution methods. |
id |
RCAP_7bbdb5c7e642e0e6c9d894e8f0611b53 |
---|---|
oai_identifier_str |
oai:repositorio.ipl.pt:10400.21/11866 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extractsSpent coffee groundsSupercritical CO2 extractionCo-solventsTriacylglycerolsFatty acidsModelingSpent coffee grounds (SCGs) were extracted with supercritical CO2 at temperatures of 313 K and 333 K, pressures up to 50.0 MPa and different scCO(2) flow rates. The addition of co-solvents isopropanol, ethanol and ethyl lactate decreased the time to achieve the maximum oil yield, to half of that with pure CO2. Analysis of the extracted oils by NMR, showed that caffeine content was (0.56-3.96) % and DUFA and MUFA contents changed within (39.8-42.0) % and (12.9-15.8) %, respectively. The analyses of fatty acids performed by GC-FID revealed the composition of the oils being 76 % of the total constituted by palmitic and linoleic esters. The DPPH antioxidant capacity was improved up to 12.5 times with co-solvents. The kinetics of oil extraction from SCGs with pure scCO(2) was modeled successfully by combining for the first time representation of the oil mixture by a single virtual molecule with group contribution methods.ElsevierRCIPLCoelho, JoseFilipe, RuiRobalo, M. PaulaBoyadzhieva, StanislavaCholakov, GeorgiStateva, Roumiana2020-06-17T14:38:49Z2020-07-012020-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/11866engCOELHO, José P.; [et al] – Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts. Journal of Supercritical Fluids. ISSN 0896-8446. Vol. 161 (2020), pp. 1-130896-844610.1016/j.supflu.2020.104825metadata 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:RCAAP2023-08-03T10:03:40Zoai:repositorio.ipl.pt:10400.21/11866Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:20:02.131976Repositório 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 |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
title |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
spellingShingle |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts Coelho, Jose Spent coffee grounds Supercritical CO2 extraction Co-solvents Triacylglycerols Fatty acids Modeling |
title_short |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
title_full |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
title_fullStr |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
title_full_unstemmed |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
title_sort |
Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts |
author |
Coelho, Jose |
author_facet |
Coelho, Jose Filipe, Rui Robalo, M. Paula Boyadzhieva, Stanislava Cholakov, Georgi Stateva, Roumiana |
author_role |
author |
author2 |
Filipe, Rui Robalo, M. Paula Boyadzhieva, Stanislava Cholakov, Georgi Stateva, Roumiana |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Coelho, Jose Filipe, Rui Robalo, M. Paula Boyadzhieva, Stanislava Cholakov, Georgi Stateva, Roumiana |
dc.subject.por.fl_str_mv |
Spent coffee grounds Supercritical CO2 extraction Co-solvents Triacylglycerols Fatty acids Modeling |
topic |
Spent coffee grounds Supercritical CO2 extraction Co-solvents Triacylglycerols Fatty acids Modeling |
description |
Spent coffee grounds (SCGs) were extracted with supercritical CO2 at temperatures of 313 K and 333 K, pressures up to 50.0 MPa and different scCO(2) flow rates. The addition of co-solvents isopropanol, ethanol and ethyl lactate decreased the time to achieve the maximum oil yield, to half of that with pure CO2. Analysis of the extracted oils by NMR, showed that caffeine content was (0.56-3.96) % and DUFA and MUFA contents changed within (39.8-42.0) % and (12.9-15.8) %, respectively. The analyses of fatty acids performed by GC-FID revealed the composition of the oils being 76 % of the total constituted by palmitic and linoleic esters. The DPPH antioxidant capacity was improved up to 12.5 times with co-solvents. The kinetics of oil extraction from SCGs with pure scCO(2) was modeled successfully by combining for the first time representation of the oil mixture by a single virtual molecule with group contribution methods. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-06-17T14:38:49Z 2020-07-01 2020-07-01T00:00:00Z |
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/10400.21/11866 |
url |
http://hdl.handle.net/10400.21/11866 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
COELHO, José P.; [et al] – Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts. Journal of Supercritical Fluids. ISSN 0896-8446. Vol. 161 (2020), pp. 1-13 0896-8446 10.1016/j.supflu.2020.104825 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
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 |
|
_version_ |
1799133468587720704 |