Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/20460
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dc.contributor.authorSantos, Joao H. P. M.pt
dc.contributor.authorMartins, Margaridapt
dc.contributor.authorSilvestre, Armando J. D.pt
dc.contributor.authorCoutinho, Joao A. P.pt
dc.contributor.authorVentura, Sonia P. M.pt
dc.date.accessioned2017-12-07T19:47:51Z-
dc.date.issued2016pt
dc.identifier.issn1463-9262pt
dc.identifier.urihttp://hdl.handle.net/10773/20460-
dc.description.abstractLignin-based materials and chemicals represent a large class of potential added-value compounds for biorefineries; however, the difficulty in fractionating heterogenous phenolic compounds that result from lignin depolymerisation still remains a challenge. Herein, a set of polymer-based aqueous biphasic systems (ABS) comprising sodium polyacrylate (NaPA 8000) and polyethylene glycol (PEG 8000), in which ionic surfactants and ionic liquids are used as electrolytes at concentrations below 1 wt%, is investigated for this purpose. Binodal curves were determined for three electrolyte concentrations, namely, 0.01, 0.1 and 1.0 wt%, and an intermediate electrolyte concentration was selected to investigate the partition of five phenolic compounds, caffeic acid, vanillic acid, gallic acid, vanillin and syringaldehyde, on these systems. The results show that the ABS allow the manipulation of the partition of the five phenolic compounds, which culminates with their selective isolation, with vanillin selectivities of S-VN/VA = 23.75, S-VN/GA = 12.52 and S-VN/CA = 8.47. The electrolyte nature seems to play an important role in the fractionation of the phenolic compounds, due to the difference in their hydrophobic nature and speciation. This study demonstrates the ability of polymeric-based ABS, using ionic surfactants or ionic liquids as electrolytes, to efficiently separate and isolate five structurally similar phenolic compounds using a low-cost and very eco-friendly integrated process.pt
dc.language.isoengpt
dc.publisherROYAL SOC CHEMISTRYpt
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147332/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F79263%2F2011/PTpt
dc.rightsrestrictedAccesspor
dc.subjectCRITICAL MICELLE CONCENTRATIONpt
dc.subject2-PHASE SYSTEMSpt
dc.subjectCLAVULANIC ACIDpt
dc.subjectPROTEIN SEPARATIONpt
dc.subjectPHASE-EQUILIBRIUMpt
dc.subjectKRAFT-LIGNINpt
dc.subjectPURIFICATIONpt
dc.subjectEXTRACTIONpt
dc.subjectOXIDATIONpt
dc.subjectOXYGENpt
dc.titleFractionation of phenolic compounds from lignin depolymerisation using polymeric aqueous biphasic systems with ionic surfactants as electrolytespt
dc.typearticlept
dc.peerreviewedyespt
ua.distributioninternationalpt
degois.publication.firstPage5569pt
degois.publication.issue20pt
degois.publication.lastPage5579pt
degois.publication.titleGREEN CHEMISTRYpt
degois.publication.volume18pt
dc.date.embargo10000-01-01-
dc.relation.publisherversion10.1039/c6gc01440bpt
dc.identifier.doi10.1039/c6gc01440bpt
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