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Automatic flow system for sequential determination of ABTS scavenging capacity and Folin-Ciocalteu index: A comparative study in food products

2007Journal article Restricted access
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dc.contributor.authorMagalhães, Luís M.
dc.contributor.authorSegundo, Marcela A.
dc.contributor.authorReis, Salette
dc.contributor.authorLima, José L. F. C.
dc.contributor.authorTóth, Ildikó V.
dc.contributor.authorRangel, António O. S. S.
dc.date.accessioned2010-10-11T17:54:19Z
dc.date.available2010-10-11T17:54:19Z
dc.date.issued2007
dc.description.abstractIn the present work, an automatic flow procedure for the sequential spectrophotometric determination of Folin-Ciocalteu reducing capacity (FC assay) and 2,2 -azinobis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation (ABTS•+) scavenging capacity expressed as the trolox equivalent (TEAC assay) is proposed for a comparative study of antioxidant properties in food products. Exploiting the flexibility of flow management associated to the computer control offered by multisyringe flow injection analysis, both methodologies were carried out in the same manifold using gallic acid and trolox as standard compounds. The proposed system configuration allowed the performance of each method separately or in tandem, providing 24 determinations per hour, which accounts for its application in routine analysis. The present methodology was applied to a large number of beverages (n = 72), namely red and white wines, herbal and tea infusions, juices and beers. The results obtained showed that FC reducing capacity and TEAC values of red wines were significantly different from those obtained for the other beverages, while tea infusions provided significantly higher TEAC values when compared to white wines, herbal infusions, juices and beers. A good correlation was found between TEAC and FC reducing capacity (R > 0.9) for red wines, herbal and tea infusions, and beers. For these beverages, similar slope values were found (106–140 mg L−1 of gallic acid per mM of Trolox), except for beers that showed a higher response for FC assay. These results provided evidence that the correlation between these assays vary according to the type of sample, reinforcing the idea that more than one method should be used for evaluation of antioxidant capacity.por
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citation"Analytica chimica acta". ISSN 0003-2670. 592: 2 (2007) 193-201por
dc.identifier.doi10.1016/j.aca.2007.04.028
dc.identifier.urihttp://hdl.handle.net/10400.14/2823
dc.language.isoengpor
dc.publisherElsevierpor
dc.subjectMultisyringe flow injection analysispor
dc.subjectFolin-Ciocalteu assaypor
dc.subjectAzinobis(3-ethylbenzothiazolinepor
dc.subjectSulfonic acid) radical cationpor
dc.subjectBeveragespor
dc.titleAutomatic flow system for sequential determination of ABTS scavenging capacity and Folin-Ciocalteu index: A comparative study in food productspor
dc.typejournal article
dspace.entity.typePublication
person.familyNameSegundo
person.familyNameLima
person.familyNameTóth
person.familyNameSantos Silva Rangel
person.givenNameMarcela
person.givenNameJosé
person.givenNameIldikó
person.givenNameAntónio Osmaro
person.identifierR-000-8FJ
person.identifier.ciencia-id0A14-B7A6-E805
person.identifier.ciencia-id4811-9AA9-D673
person.identifier.ciencia-idD61D-7CFB-178A
person.identifier.orcid0000-0003-2938-0214
person.identifier.orcid0000-0002-8906-9826
person.identifier.orcid0000-0002-7342-1063
person.identifier.orcid0000-0002-6486-8947
person.identifier.ridA-1009-2010
person.identifier.ridG-1733-2010
person.identifier.scopus-author-id6602384941
person.identifier.scopus-author-id10141079100
person.identifier.scopus-author-id35512332800
person.identifier.scopus-author-id7004827387
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication84c05a53-23fa-4f4b-b007-d1a5fc748d5a
relation.isAuthorOfPublication71f20aa3-d4ae-40c3-a9ef-27d88442d1e0
relation.isAuthorOfPublication7889563f-f3fc-4057-a97c-b51425b4dc46
relation.isAuthorOfPublication467be022-fd9c-4549-aa48-48ebcc1098eb
relation.isAuthorOfPublication.latestForDiscovery467be022-fd9c-4549-aa48-48ebcc1098eb

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