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Obtaining Hydroxytyrosol from Olive Mill Waste Using Deep Eutectic Solvents and Then Supercritical CO2

dc.contributor.authorPlaza A.
dc.contributor.authorTapia X.
dc.contributor.authorYañez C.
dc.contributor.authorVilches F.
dc.contributor.authorCandia O.
dc.contributor.authorCabezas R.
dc.contributor.authorRomero J.
dc.date.accessioned2020-09-02T22:25:52Z
dc.date.available2020-09-02T22:25:52Z
dc.date.issued2019
dc.identifier10.1007/s12649-019-00836-1
dc.identifier.issn18772641
dc.identifier.urihttps://hdl.handle.net/20.500.12728/5814
dc.descriptionThe main objective of this study was to recover hydroxytyrosol from olive mill waste (olive leaves and a semi-solid waste with a 65–75% of humidity called alperujo). The recovery process involved solid–liquid extractions using two hydrophilic deep eutectic solvents (DESs), CIS-DES (a 1:1 mixture of choline chloride and citric acid) and Etagline (a 1:2 mixture of choline chloride and ethylene glycol). The results achieved using this non-conventional process was compared with the results achieved using conventional solid–liquid extraction processes using ethanol, methanol, and water. The extraction ratio (R) achieved using Etagline DES was 11.4 times higher than the R achieved using methanol. The hydroxytyrosol extraction efficiencies were higher when using the selected DESs than using methanol, under the same working conditions. On the other hand, with the use of DES it is possible to obtain similar extraction efficiencies to those obtained with organic solvents, but using 75% less extraction phase, when DESs were used instead of methanol. The DES extraction processes gave high re-extraction capacities when supercritical CO2 was used as a stripping phase. The highest pure hydroxytyrosol extraction efficiency, 80%, was achieved using Etagline and supercritical CO2 re-extraction at a pressure and temperature close to the critical values. The results suggest that DES is an efficient, safe, and sustainable alternative to methanol for extracting bioactive compounds from olive mill waste and that DES extraction combined with supercritical CO2 extraction can be classed as a green process. Graphic Abstract: [Figure not available: see fulltext.] © 2019, Springer Nature B.V.
dc.language.isoen
dc.publisherSpringer Netherlands
dc.subjectDeep eutectic solvent extraction
dc.subjectGreen process
dc.subjectHydroxytyrosol recovery
dc.subjectOlive mill wastes
dc.subjectSupercritical fluid extraction
dc.subjectCarbon dioxide
dc.subjectChlorine compounds
dc.subjectEfficiency
dc.subjectEffluent treatment
dc.subjectEthylene
dc.subjectEthylene glycol
dc.subjectEutectics
dc.subjectMethanol
dc.subjectMixtures
dc.subjectRecovery
dc.subjectSupercritical fluid extraction
dc.subjectSupercritical fluids
dc.subjectBioactive compounds
dc.subjectDeep eutectic solvents
dc.subjectExtraction efficiencies
dc.subjectGreen process
dc.subjectHydroxytyrosol
dc.subjectOlive-mill waste
dc.subjectPressure and temperature
dc.subjectSupercritical CO2 extraction
dc.subjectOrganic solvents
dc.titleObtaining Hydroxytyrosol from Olive Mill Waste Using Deep Eutectic Solvents and Then Supercritical CO2
dc.typeArticle


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