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Degradation of compounds present in cork boiling water by gamma radiation

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dc.contributor.authorMadureira, Joana
dc.contributor.authorBarros, Lillian
dc.contributor.authorMelo, Rita
dc.contributor.authorSantos, Pedro M.P.
dc.contributor.authorFalcão, António N.
dc.contributor.authorCabo Verde, Sandra
dc.contributor.authorFerreira, Isabel C.F.R.
dc.contributor.authorMargaça, Fernanda M.A.
dc.date.accessioned2016-09-16T15:09:14Z
dc.date.available2016-09-16T15:09:14Z
dc.date.issued2016
dc.description.abstractCork boiling water is an aqueous and complex dark liquor with high concentration of phenolic compounds such as phenolic acids and tannins [1, 2], which are considered biorecalcitrants [2]. Ionizing radiation has been widely studied as an alternative technology for the degradation of organic contaminants without the addition of any other (e.g.: Fenton technologies). The aim of this work was to identify the compounds present in cork boiling water and further evaluate the resulting stable degradation products after gamma irradiation. The irradiation experiments of standard solutions were carried out at room temperature using a Co-60 experimental equipment. The applied absorbed doses were 20 and 50 kGy at a dose rate of 1.5 kGy/h, determined by routine dosimeters [3]. The identification of radiolytic products was carried out by HPLC-DAD-ESI/MS. The phenolic compounds were identified by comparing their retention times and UV–vis and mass spectra with those obtained from standard compounds, when available, as well as by comparing the obtained information with available data reported in the literature. Concerning the obtained results and the literature review, the main cork wastewater components are: quinic, gallic, protocatechuic, vanillic, syringic and ellagic acids. Based on this, we used protocatechuic, vanillic and syringic acids as model compounds to study their degradation by gamma radiation in order to identify the corresponding radiolytic products. Standard aqueous solutions were irradiated and the derivatives of each model compound are represented in figure 1. The obtained results seem to demonstrate that the derivatives of the parent compounds could also be phenolic acids, since it was observed the loss of 44 u (CO2) from the [M-H]- ions. Gallic and protocatechuic acids are identified as derivatives of vanillic and syringic acids, and gallic acid as a protocatechuic acid derivative. Compound 5 ([M-H]- at m/z 169) was tentatively identified as 2,4,6-trihydroxybenzoic acid, since its fragmentation pattern (m/z 151, 125 and 107) is similar to that previously reported in literature [4]. The structure of compound 7 was proposed based on the molecular ion and its fragmentation and compound 6 remains unknown.pt_PT
dc.identifier.citationMadureira, Joana; Barros, Lillian; Melo, R.; Santos, Pedro M.P.; Falcão, Antonio N.; Cabo-Verde, Sandra; Ferreira, Isabel C.F.R.; Margaça, Fernanda M.A. (2016). Degradation of compounds present in cork boiling water by gamma radiation. In XVI Latin-American Congress on Chromatography & 9th National Metting on Chromatography. Lisboapt_PT
dc.identifier.urihttp://hdl.handle.net/10198/13245
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationApplication of Ionizing Radiation for a Sustainable Environment
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.titleDegradation of compounds present in cork boiling water by gamma radiationpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleApplication of Ionizing Radiation for a Sustainable Environment
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/RECI%2FAAG-TEC%2F0400%2F2012/PT
oaire.citation.conferencePlaceLisboa, Portugalpt_PT
oaire.citation.titleXVI Latin-American Congress on Chromatography & 9th National Metting on Chromatographypt_PT
oaire.fundingStream3599-PPCDT
person.familyNameBarros
person.familyNameFerreira
person.givenNameLillian
person.givenNameIsabel C.F.R.
person.identifier469085
person.identifier144781
person.identifier.ciencia-id9616-35CB-D001
person.identifier.ciencia-id9418-CF95-9919
person.identifier.orcid0000-0002-9050-5189
person.identifier.orcid0000-0003-4910-4882
person.identifier.ridJ-3600-2013
person.identifier.ridE-8500-2013
person.identifier.scopus-author-id35236343600
person.identifier.scopus-author-id36868826600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublicationbd0d1537-2e03-41fb-b27a-140af9c35db8
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