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dc.contributor.authorBenito Román, Oscar 
dc.contributor.authorBlanco, Beatriz
dc.contributor.authorSanz Díez, Mª Teresa 
dc.contributor.authorBeltrán Calvo, Sagrario 
dc.date.accessioned2021-11-04T09:22:56Z
dc.date.available2021-11-04T09:22:56Z
dc.date.issued2020-12
dc.identifier.issn2076-3921
dc.identifier.urihttp://hdl.handle.net/10259/6088
dc.description.abstractThe valorization of onion skin wastes (OSW) through the extraction, identification, and quantification of phenolic compounds was studied in this work, using subcritical water in a semicontinuous extractor (2.5 mL/min; 105–180 C; 5 MPa). The extraction of flavonoids resulted to be fast (<30 min) and temperature sensitive (maximum at 145 C; total flavonoids, 27.4 0.9 mg/g dry OSW (DOSW)). The experimental results were fitted to theWeibull model. The influence of the solvent properties on the flavonoids quantification was found to be critical. A precipitate was formed once the extracts cooled down. If removed, a significant fraction of the high temperature extracted flavonoids (as much as 71%, at 180 C) was lost. Such a condition a ected especially those compounds that show extremely low solubility in water at room temperature, whereas quercetin glycosylated derivatives were less a ected by the polarity change of the medium induced by the temperature change. It was demonstrated that it is necessary to re-dissolve the subcritical water extracts by the addition of ethanol, which led to a medium with a polarity equivalent to that obtained with water at high temperature. At 145 C, quercetin (15.4 0.4 mg/g DOSW) and quercetin-40-glucoside (8.4 0.1 mg/g DOSW) accounted for the 90% of the total flavonoids identified. By recovering high added value bioactive compounds from OSW the principles of circular economy were fulfilled, providing a new use for this agricultural waste.en
dc.description.sponsorshipJunta de Castilla y León (JCyL) and the European Regional Development Fund (ERDF)) through projects BU301P18 and BU050P20, and by the Agencia Estatal de Investigación through grant number PID2019-104950RB-I00/AEI/10.13039/501100011033. OBR’s postdoctoral contract was funded by JCyL and EDRF through project BU301P18.en
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherMDPI
dc.relation.ispartofAntioxidants. 2020, V. 9, n. 12, 1233en
dc.rightsAtribución 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectOnionen
dc.subjectExtractionen
dc.subjectSubcritical wateren
dc.subjectQuercetinen
dc.subjectPolarityen
dc.subjectValorizationen
dc.subject.otherIngeniería químicaes
dc.subject.otherChemical engineeringen
dc.titleSubcritical water extraction of phenolic compounds from onion skin wastes (Allium cepa cv. horcal): effect of temperature and solvent propertiesen
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.publisherversionhttps://doi.org/10.3390/antiox9121233
dc.identifier.doi10.3390/antiox9121233
dc.journal.titleAntioxidantsen
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones


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