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Effects of gamma irradiation on antioxidant potential and chemical composition of Ginkgo biloba L.: a comparative study of 1 and 10 kGy doses

2014Conference object Open access
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dc.contributor.authorPereira, Eliana
dc.contributor.authorBarros, Lillian
dc.contributor.authorAntonio, Amilcar L.
dc.contributor.authorCabo Verde, Sandra
dc.contributor.authorBento, Albino
dc.contributor.authorFerreira, Isabel C.F.R.
dc.date.accessioned2015-02-24T09:55:14Z
dc.date.available2015-02-24T09:55:14Z
dc.date.issued2014
dc.description.abstractGinkgo biloba L. is a very old tree widely used in pharmaceutical industry to combat some diseases; in particular, is has been experimentally used as a natural therapeutic agent in the treatment of Alzheimer's disease [1,2]. Irradiation is a methodology accredited for dry ingredients, being increasingly recognized, and represents almost 50% of the world market for post-harvest preserved foods (~186 000 ton). Furthermore, irradiation might also represent a suitable solution for medicinal plants postharvest treatment in order to guarantee their decontamination [3,4,5]. In this study, the effects of gamma irradiation (1 and 10 kGy) in the antioxidant properties and chemical composition of G. biloba were evaluated. Radical scavenging activity, reducing power and inhibition of lipid peroxidation in brain homogenates were used to evaluate antioxidant potential. Macronutrients (protein, fat, carbohydrates and ash) were determined following official procedures of analysis; hydrophilic (sugars and organic acids) and lipophilic (fatty acids and tocopherols) compounds were determined by chromatographic techniques coupled to different detectors. In general, the methanolic extract gave higher antioxidant activity (lower EC50 values) than the corresponding infusions. For both infusion and methanolic extract, gamma irradiation at both doses increased 2,2-diphenyl-1- pycrilhydrazil (DPPH) scavenging activity, reducing power, β-carotene bleaching and lipid peroxidation inhibition of Ginkgo samples. In chemical composition this process preserved macronutrients (ash, fat and energy were not changed), fatty acids, γ- and δ-tocopherols, fructose, trehalose, quinic and shikimic acids. In particular, 1 kGy protected α-tocopherol, oxalic and malic acids contents, while 10 kGy decreased proteins, α-tocopherol, glucose, sucrose, oxalic and malic acids level. Overall, irradiation at 10 kGy potentiated more the antioxidant activity of methanolic extract and infusion obtained from leaves and 1 kGy would be the recommended dose to maintain nutritional profile of G. biloba, protecting specific molecules.por
dc.description.sponsorshipThe authors are grateful to PRODER nº 53514, AROMAP, for financial support of the work and E. Pereira grant, to Mrs. Clarinda Paixão, from Américo Duarte Paixão Lda, for samples providing and to FCT for financial support to CIMO (PEst-OE/AGR/UI0690/2011) and L. Barros (Compromisso para a Ciência 2008).por
dc.identifier.citationPereira, Eliana; Barros, Lillian; Antonio, Amilcar L.; Cabo Verde, Sandra; Bento, Albino; Ferreira, Isabel C.F.R. (2014). Effects of gamma irradiation on antioxidant potential and chemical composition of Ginkgo biloba L.: a comparative study of 1 and 10 kGy doses. In International Symposium on Food Safety and Quality: Applications of Nuclear and Related Techniques. Vienapor
dc.identifier.urihttp://hdl.handle.net/10198/11691
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherIAEA - International Atomic Energy Agencypor
dc.relationPRODER 53514, AROMAP
dc.relationStrategic Project - UI 690 - 2011-2012
dc.subjectGinkgo biloba L.por
dc.subjectGamma irradiationpor
dc.subjectAntioxidant potentialpor
dc.titleEffects of gamma irradiation on antioxidant potential and chemical composition of Ginkgo biloba L.: a comparative study of 1 and 10 kGy dosespor
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleStrategic Project - UI 690 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FAGR%2FUI0690%2F2011/PT
oaire.citation.conferencePlaceViena, Áustriapor
oaire.citation.titleInternational Symposium on Food Safety and Quality: Applications of Nuclear and Related Techniquespor
oaire.fundingStream6817 - DCRRNI ID
person.familyNamePereira
person.familyNameBarros
person.familyNameAntonio
person.familyNameBento
person.familyNameFerreira
person.givenNameEliana
person.givenNameLillian
person.givenNameAmilcar L.
person.givenNameAlbino
person.givenNameIsabel C.F.R.
person.identifier469085
person.identifier144781
person.identifier.ciencia-idBE17-462D-9A75
person.identifier.ciencia-id9616-35CB-D001
person.identifier.ciencia-id1014-5259-DE86
person.identifier.ciencia-idD516-325A-9AD7
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person.identifier.orcid0000-0003-2854-6745
person.identifier.orcid0000-0002-9050-5189
person.identifier.orcid0000-0001-8271-9964
person.identifier.orcid0000-0001-5215-785X
person.identifier.orcid0000-0003-4910-4882
person.identifier.ridQ-8017-2018
person.identifier.ridJ-3600-2013
person.identifier.ridJ-1960-2014
person.identifier.ridN-9706-2016
person.identifier.ridE-8500-2013
person.identifier.scopus-author-id55938912300
person.identifier.scopus-author-id35236343600
person.identifier.scopus-author-id44560921900
person.identifier.scopus-author-id35247694000
person.identifier.scopus-author-id36868826600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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