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Microwave-assisted extraction of phenolic compounds from spent coffee grounds. Process optimization applying design of experiments

2021-12-02Journal article Open access
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dc.contributor.authorCoelho, Jose
dc.contributor.authorRobalo, Maria Paula
dc.contributor.authorBoyadzhieva, Stanislava
dc.contributor.authorStateva, Roumiana
dc.date.accessioned2022-01-13T11:47:35Z
dc.date.available2022-01-13T11:47:35Z
dc.date.issued2021-12-02
dc.description.abstractIn this study, sustainable technology microwave-assisted extraction (MAE) in association with green solvents was applied to recover phenolic compounds from spent coffee grounds (SCGs). A design of experiments (DOE) was used for process optimization. Initially, a 2(4-1) two level Fractional Factorial Design was used and ratios "solvent to solute" and "ethanol to water" were identified as the significant experimental factors. Consequently, Central Composite Design (CCD) was applied to analyze the effects of the significant variables on the response yield, total polyphenols content (TPC), and antioxidant activity (AA) by the DPPH assay method, and quadratic surfaces to optimize those responses were generated. The values of the significant factors of 16.7 (solvent/solute) and 68.9% (ethanol/water) were optimized simultaneously the yield (%) at 6.98 +/- 0.27, TPC (mg GAE/g) at 117.7 +/- 6.1, and AA (mu mol TE/g) at 143.8 +/- 8.6 and were in excellent agreement with those predicted from the CCD model. The variations of the compositions of the lipids, caffeine, pentacyclic diterpenes, and FAME as a function of the dominant factor % ethanol in the solvent mixture were analyzed by applying NMR and GC-FID, and the results obtained confirmed their determinative significance.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCOELHO, José P.; [et al] – Microwave-assisted extraction of phenolic compounds from spent coffee grounds. Process optimization applying design of experiments. Molecules. eISSN 1420-3049. Vol. 26, N.º 23 (2021), pp. 1-15.pt_PT
dc.identifier.doi10.3390/molecules26237320pt_PT
dc.identifier.eissn1420-3049
dc.identifier.urihttp://hdl.handle.net/10400.21/14153
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationUIDB/00100/2020 - FCTpt_PT
dc.relationIntegrated Process and Product Design for Sustainable Biorefineries
dc.relation.publisherversionhttps://www.mdpi.com/1420-3049/26/23/7320pt_PT
dc.subjectMicrowave extractionpt_PT
dc.subjectGreen technologypt_PT
dc.subjectSpent coffee groundspt_PT
dc.subjectDesign of experimentspt_PT
dc.subjectTotal polyphenols contentpt_PT
dc.titleMicrowave-assisted extraction of phenolic compounds from spent coffee grounds. Process optimization applying design of experimentspt_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.endPage15pt_PT
oaire.citation.issue23pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleMoleculespt_PT
oaire.citation.volume26pt_PT
oaire.fundingStreamH2020
person.familyNameCoelho
person.familyNameRobalo
person.familyNameStateva
person.givenNameJose
person.givenNameMaria Paula
person.givenNameRoumiana
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.orcid0000-0002-4834-8183
person.identifier.ridG-2626-2011
person.identifier.ridB-2002-2012
person.identifier.scopus-author-id7101841005
person.identifier.scopus-author-id9269662100
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationec13b922-f442-44fa-bb07-7c2e0bebbe6d
relation.isAuthorOfPublication823a9498-17ab-451f-bb8f-56338643ac0c
relation.isAuthorOfPublicationf29f8912-6df5-4f63-959d-b3998a9a8c28
relation.isAuthorOfPublication.latestForDiscoveryec13b922-f442-44fa-bb07-7c2e0bebbe6d
relation.isProjectOfPublication7430f8ad-f49e-4fda-8972-6a0d7db97b35
relation.isProjectOfPublication.latestForDiscovery7430f8ad-f49e-4fda-8972-6a0d7db97b35

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