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Dose-response effects of gamma irradiation on colour and antioxidant activity of wild Malva neglecta

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dc.contributor.authorPinela, José
dc.contributor.authorAntonio, Amilcar L.
dc.contributor.authorBarros, Lillian
dc.contributor.authorCarvalho, Ana Maria
dc.contributor.authorOliveira, Beatriz
dc.contributor.authorFerreira, Isabel C.F.R.
dc.date.accessioned2015-02-24T09:44:24Z
dc.date.available2015-02-24T09:44:24Z
dc.date.issued2014
dc.description.abstractRadiation processing technology has been used to improve food security, safety and quality. However there are a few reports in the literature on the effect of irradiation on bioactivity of herbs and medicinal plants [1]. Hence, the present work was undertaken to investigate the dose-response effects of gamma irradiation on the colour and antioxidant activity of wild Malva neglecta Wallr. In the north-eastern of Portugal, this annual herbaceous plant is traditionally eaten raw as leafy vegetable or prepared in herbal beverages due to its disinfectant and anti-inflammatory properties [2]. Dried M. neglecta samples were exposed to 0 (control), 1, 5 and 10 kGy of γ-rays in a 60Co experimental chamber. After irradiation, the values of CIE L* (lightness), a* (redness) and b* (yellowness) were measured using a Minolta colorimeter; and the antioxidant activity determined in decoction preparations through the DPPH (2,2-diphenyl-1-picrylhydrazyl) free radicals scavenging activity assay, reducing power by the ferricyanide/prussian blue assay, and lipid peroxidation inhibition by β-carotene/linoleate and thiobarbituric acid reactive substances (TBARS) assays. The results suggest that the irradiation treatment with doses up to 10 kGy have no influence on trichromatic colour values L*, a* or b*. However, the effect on the antioxidant activity was somehow different. Samples irradiated with doses of 1 and 5 kGy exhibited higher antioxidant performances than the non-irradiated control in the ferricyanide/prussian blue and TBARS assays. Otherwise, irradiation dose of 10 kGy led to a decrease in antioxidant activity (showing higher EC50 values) in all in vitro assays. Overall, this study demonstrated that gamma irradiation at 10 kGy can adversely affect the antioxidant activity of M. neglecta decoctions, but has no effect on colour parameters.por
dc.identifier.citationPinela, José; Antonio, Amilcar L.; Barros, Lillian; Carvalho, Ana Maria; Oliveira, M. Beatriz P.P.; Ferreira, Isabel C.F.R. (2014). Dose-response effects of gamma irradiation on colour and antioxidant activity of wild Malva neglecta. In International Symposium on Food Safety and Quality: Applications of Nuclear and Related Techniques. Vienapor
dc.identifier.urihttp://hdl.handle.net/10198/11688
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherIAEA - International Atomic Energy Agencypor
dc.relationStrategic Project - UI 690 - 2011-2012
dc.relationRECOVERY OF THE SUSTAINABLE USE OF TRADITIONAL FOODS THROUGH EMERGING PRESERVATION TECHNOLOGIES
dc.subjectMalva neglectapor
dc.subjectGamma irradiationpor
dc.subjectColourpor
dc.subjectAntioxidant activitypor
dc.titleDose-response effects of gamma irradiation on colour and antioxidant activity of wild Malva neglectapor
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleStrategic Project - UI 690 - 2011-2012
oaire.awardTitleRECOVERY OF THE SUSTAINABLE USE OF TRADITIONAL FOODS THROUGH EMERGING PRESERVATION TECHNOLOGIES
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FAGR%2FUI0690%2F2011/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F92994%2F2013/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.familyNamePinela
person.familyNameAntonio
person.familyNameBarros
person.familyNameMaria Carvalho
person.familyNameFerreira
person.givenNameJosé
person.givenNameAmilcar
person.givenNameLillian
person.givenNameAna
person.givenNameIsabel C.F.R.
person.identifier469085
person.identifierID G-7399-2011
person.identifier144781
person.identifier.ciencia-id771C-2B43-B108
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person.identifier.ciencia-id9418-CF95-9919
person.identifier.orcid0000-0001-7523-1637
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person.identifier.orcid0000-0002-9050-5189
person.identifier.orcid0000-0001-5508-5935
person.identifier.orcid0000-0003-4910-4882
person.identifier.ridB-4466-2014
person.identifier.ridJ-1960-2014
person.identifier.ridJ-3600-2013
person.identifier.ridE-8500-2013
person.identifier.scopus-author-id54392272800
person.identifier.scopus-author-id44560921900
person.identifier.scopus-author-id35236343600
person.identifier.scopus-author-id20336503900
person.identifier.scopus-author-id36868826600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspor
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