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Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts

2020-07-01Journal article Restricted access
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dc.contributor.authorCoelho, Jose
dc.contributor.authorFilipe, Rui
dc.contributor.authorRobalo, M. Paula
dc.contributor.authorBoyadzhieva, Stanislava
dc.contributor.authorCholakov, Georgi
dc.contributor.authorStateva, Roumiana
dc.date.accessioned2020-06-17T14:38:49Z
dc.date.available2020-06-17T14:38:49Z
dc.date.issued2020-07-01
dc.description.abstractSpent 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.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCOELHO, 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. 1-13pt_PT
dc.identifier.doi10.1016/j.supflu.2020.104825pt_PT
dc.identifier.issn0896-8446
dc.identifier.urihttp://hdl.handle.net/10400.21/11866
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationDH 07/12 - National Science Fund, Ministry of Education and Science of Bulgariapt_PT
dc.relationIntegrated Process and Product Design for Sustainable Biorefineries
dc.relationUID/QUI/00100/2019 - FCTpt_PT
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dc.subjectSpent coffee groundspt_PT
dc.subjectSupercritical CO2 extractionpt_PT
dc.subjectCo-solventspt_PT
dc.subjectTriacylglycerolspt_PT
dc.subjectFatty acidspt_PT
dc.subjectModelingpt_PT
dc.titleSupercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extractspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleIntegrated Process and Product Design for Sustainable Biorefineries
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/778168/EU
oaire.citation.endPage13pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of Supercritical Fluidspt_PT
oaire.citation.volume161pt_PT
oaire.fundingStreamH2020
person.familyNameCoelho
person.familyNameFilipe
person.familyNameRobalo
person.familyNameCholakov
person.familyNameStateva
person.givenNameJose
person.givenNameRui
person.givenNameMaria Paula
person.givenNameGeorgi
person.givenNameRoumiana
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person.identifier.scopus-author-id56979510700
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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