The reduction of Cu(II)/neocuproine complexes by some polyphenols: Total polyphenols determination in wine samples

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dc.contributor.authorLee G.
dc.contributor.authorRossi M.V.
dc.contributor.authorCoichev N.
dc.contributor.authorMoya H.D.
dc.date.accessioned2024-03-13T01:11:17Z
dc.date.available2024-03-13T01:11:17Z
dc.date.issued2011
dc.description.abstractA new method is presented for spectrophotometric determination of total polyphenols content in wine. The procedure is a modified CUPRAC method based on the reduction of Cu(II), in hydroethanolic medium (pH 7.0) in the presence of neocuproine (2,9-dimethyl-1,10-phenanthroline), by polyphenols, yielding a Cu(I) complexes with maximum absorption peak at 450 nm. The absorbance values are linear (r = 0.998, n = 6) with tannic acid concentrations from 0.4 to 3.6 μmol L-1. The limit of detection obtained was 0.41 μmol L -1 and relative standard deviation 1.2% (1 μmol L-1; n = 8). Recoveries between 80% and 110% (mean value of 95%) were calculated for total polyphenols determination in 14 commercials and 2 synthetic wine samples (with and without sulphite). The proposed procedure is about 1.5 more sensitive than the official Folin-Ciocalteu method. The sensitivities of both methods were compared by the analytical responses of several polyphenols tested in each method. © 2010 Elsevier Ltd. All rights reserved.
dc.description.firstpage679
dc.description.issuenumber2
dc.description.lastpage686
dc.description.volume126
dc.identifier.doi10.1016/j.foodchem.2010.11.020
dc.identifier.issn0308-8146
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36988
dc.relation.ispartofFood Chemistry
dc.rightsAcesso Restrito
dc.subject.otherlanguageCopper
dc.subject.otherlanguageNeocuproine
dc.subject.otherlanguagePolyphenols
dc.subject.otherlanguageWine
dc.titleThe reduction of Cu(II)/neocuproine complexes by some polyphenols: Total polyphenols determination in wine samples
dc.typeArtigo
local.scopus.citations21
local.scopus.eid2-s2.0-78650678805
local.scopus.subjectAbsorbance values
local.scopus.subjectAbsorption peaks
local.scopus.subjectCu complexes
local.scopus.subjectLimit of detection
local.scopus.subjectMean values
local.scopus.subjectNeocuproine
local.scopus.subjectPhenanthrolines
local.scopus.subjectPolyphenols
local.scopus.subjectRelative standard deviations
local.scopus.subjectSpectrophotometric determination
local.scopus.subjectTannic acid
local.scopus.subjectWine sample
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78650678805&origin=inward
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