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Processing of Onion Skin Extracts with Quercetin-Molecularly Imprinted Adsorbents Working at a Wide Range of Water Content

2020Artigo científico Acesso aberto
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dc.contributor.authorGomes, Catarina
dc.contributor.authorFranco, V.
dc.contributor.authorDias, Rolando
dc.contributor.authorCosta, Mário Rui
dc.date.accessioned2018-02-19T10:00:00Z
dc.date.accessioned2021-03-18T14:49:12Z
dc.date.available2018-01-19T10:00:00Z
dc.date.available2021-03-18T14:49:12Z
dc.date.issued2020
dc.description.abstractA simple adsorption process allowing a high retention of polyphenols contained in extracts of onion skin with ethanol/water volume ratio going up to 80/20 is described. We show that the straightforward processing of the extracts is possible, even at low water content, by using quercetin-molecularly imprinted (Q-MIP) adsorbents synthesized with 4-vinylpyridine (4VP) as the functional monomer. The favorable interactions between the pyridyl functional groups of 4VP and the polyphenols, as well as the improved binding site accessibility introduced by molecular imprinting, are at the source for the good performance observed with the Q-MIPs. The usefulness of the Q-MIPs in onion skin polyphenols purification, fractionation and concentration is demonstrated with few sorption/desorption steps and considering sonicated, Soxhlet and supercritical CO2 extracts. Polyphenol retention of c.a. 88% is possible with Q-MIPs (7% with non-tailored adsorbents) when directly processing ethanol/water 80/20 extracts. Protocatechuic acid and other very hydrophilic molecules (such as simple sugars) were readily removed from the extracts, leaving fractions containing mostly quercetin and quercetin derivatives. Polyphenol recovery higher than 90% (measured with quercetin) and concentration factors up to 34 times were observed with the Q-MIPs. Graphic abstract: [Figure not available: see fulltext.]en_EN
dc.description.versioninfo:eu-repo/semantics/publishedVersionen_EN
dc.identifier.citationGomes, C. P.; Franco, V.; Dias, Rolando C.S.; Costa, M. R.P.F.N. (2020). Processing of Onion Skin Extracts with Quercetin-Molecularly Imprinted Adsorbents Working at a Wide Range of Water Content. Chromatographia. ISSN 0009-5893. 83:12, p. 1539-1551en_EN
dc.identifier.doi10.1007/s10337-020-03958-0en_EN
dc.identifier.issn00095893
dc.identifier.urihttp://hdl.handle.net/10198/23359
dc.language.isoeng
dc.peerreviewedyesen_EN
dc.relationPOCI-01-0145-FEDER-006984
dc.subjectAdsorbentsen_EN
dc.subjectDownstream processingen_EN
dc.subjectMolecular imprintingen_EN
dc.subjectOnion residuesen_EN
dc.subjectPolyphenolsen_EN
dc.titleProcessing of Onion Skin Extracts with Quercetin-Molecularly Imprinted Adsorbents Working at a Wide Range of Water Contenten_EN
dc.typejournal article
dspace.entity.typePublication
person.familyNameGomes
person.familyNameDias
person.givenNameCatarina P.
person.givenNameRolando
person.identifier.ciencia-id2B12-75A1-B8FB
person.identifier.ciencia-id8417-4D84-973B
person.identifier.orcid0000-0003-3396-3615
person.identifier.orcid0000-0001-7369-382X
person.identifier.ridM-8552-2013
person.identifier.scopus-author-id57190981477
person.identifier.scopus-author-id7102885104
rcaap.rightsopenAccessen_EN
rcaap.typearticleen_EN
relation.isAuthorOfPublicationeeffa916-1197-416e-a4fd-22281823df55
relation.isAuthorOfPublicationd7109687-6adf-4268-a462-8d1a2e2c01cb
relation.isAuthorOfPublication.latestForDiscoveryd7109687-6adf-4268-a462-8d1a2e2c01cb

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