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Antioxidant profile of Stevia rebaudiana Bertoni cultivated in Portugal and submitted to different conservation conditions

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dc.contributor.authorBarroso, Marisa
dc.contributor.authorBarros, Lillian
dc.contributor.authorRodrigues, M.A.
dc.contributor.authorSousa, Maria João
dc.contributor.authorSantos-Buelga, Celestino
dc.contributor.authorFerreira, Isabel C.F.R.
dc.date.accessioned2016-09-16T13:33:57Z
dc.date.available2016-09-16T13:33:57Z
dc.date.issued2016
dc.description.abstractThe demand for natural sweeteners has been gaining more and more importance due to the great controversy associated with the use of some synthetic sweeteners as cyclamates, aspartame and acesulfame-K. The steviol glycosides (E 960) are a group of natural sweeteners of generalized use; these compounds are obtained from Stevia rebaudiana Bertoni, a sweet plant native from South America (Carocho et al., 2015). However, Stevia rebaudiana Bertoni may have other uses to be exploited, in particular due to its antioxidant capacity. This plant is already produced in Portugal but it is important to evaluate if the plant chemical composition is maintained regardless of culture conditions. Therefore, in this study, stevia samples were cultivated in Braganca (northeastern of Portugal) in a field trial with defined culture conditions. After harvesting, the plants were submitted to two different treatments: kept fresh by freezing (-20°C) and oven-dried (30°C). The antioxidant profile of the samples was studied through evaluation of free radicals scavenging activity, reducing power, phenolic compounds (HPLC-DAD-ESI/MS), tocopherols (HPLC-fluorescence) and free sugars (HPLC-RI). Significant differences were observed: while oven-dried samples showed the highest antioxidant activity and phenolic compounds concentration (mainly 5-O-caffeoylquinic acid and 3,5-O-dicaffeoylquinic acid), the frozen fresh samples had the highest values of total tocopherols and total sugars. These results confirm that the plants grown in Bragança have excellent bioactive secondary metabolites responsible for the observed antioxidant capacity.pt_PT
dc.identifier.citationBarroso, Marisa; Barros, Lillian; Rodrigues, M.A.; Sousa, Maria João; Santos-Buelga, Celestino; Ferreira, Isabel C.F.R. (2016). Antioxidant profile of Stevia rebaudiana Bertoni cultivated in Portugal and submitted to different conservation conditions. In 1st European Conference of Post graduate Horticulture Scientists. Palermo, Itáliapt_PT
dc.identifier.urihttp://hdl.handle.net/10198/13240
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.titleAntioxidant profile of Stevia rebaudiana Bertoni cultivated in Portugal and submitted to different conservation conditionspt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlacePalermo, Itáliapt_PT
oaire.citation.title1st European Conference of Post graduate Horticulture Scientistspt_PT
person.familyNameBarros
person.familyNameRodrigues
person.familyNameSousa
person.familyNameFerreira
person.givenNameLillian
person.givenNameManuel
person.givenNameMaria João
person.givenNameIsabel C.F.R.
person.identifier469085
person.identifier144781
person.identifier.ciencia-id9616-35CB-D001
person.identifier.ciencia-id371D-DF0D-8D68
person.identifier.ciencia-idD91E-3571-3979
person.identifier.ciencia-id9418-CF95-9919
person.identifier.orcid0000-0002-9050-5189
person.identifier.orcid0000-0002-5367-1129
person.identifier.orcid0000-0002-9946-4926
person.identifier.orcid0000-0003-4910-4882
person.identifier.ridJ-3600-2013
person.identifier.ridO-1721-2016
person.identifier.ridE-8500-2013
person.identifier.scopus-author-id35236343600
person.identifier.scopus-author-id35270106800
person.identifier.scopus-author-id55230282700
person.identifier.scopus-author-id36868826600
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublication43621353-fa11-4559-9b24-27eba5ad3de0
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