dc.contributor.author	Lao, Mireia
dc.contributor.author	Companys Ferran, Encarnació
dc.contributor.author	Weng, Liping
dc.contributor.author	Puy Llorens, Jaume
dc.contributor.author	Galceran i Nogués, Josep
dc.date.accessioned	2018-09-14T07:03:29Z
dc.date.available	2018-09-14T07:03:29Z
dc.date.issued	2018
dc.identifier.issn	0308-8146
dc.identifier.uri	http://hdl.handle.net/10459.1/64708
dc.description.abstract	Free concentrations of Zn2+, Fe3+, Ca2+ and Mg2+ in a red wine (Raimat, Catalonia, Spain) have been determined, with the Donnan Membrane Technique (DMT) for the first time. The required equilibration time benefits from the acceptor solution including major cations. K+ and Na+, mainly unbound to any ligand in the sample, have been identified as suitable reference ions. A free Zn concentration of 1.76 micromol L-1 determined with DMT was in excellent agreement with the free Zn concentration independently provided by the electroanalytical technique Absence of Gradients and Nernstian Equilibrium Stripping (AGNES), 1.7 micromol L-1, amounting to 14.4% of the total Zn. The free concentrations found in this wine were 1.79 micromol L-1 Fe3+, 1.11 mmol L 1 Ca2+ and 3.4 mmol L-1 Mg2+ (8.82%, 40% and 57% of their total concentrations). Prior to the application of the techniques to the red wine, they had been cross-validated in Zn-tartrate solutions.
dc.description.sponsorship	This work was financially supported by the Spanish Ministerio de Economía y Competitividad (projects CTM2013-48967 and CTM2016-78798), and from the “Comissionat per a Universitats i Recerca del Departament d’Innovació, Universitats i Empresa de la Generalitat de Catalunya”.
dc.format.mimetype	application/pdf
dc.language.iso	eng
dc.publisher	Elsevier
dc.relation	MINECO/PN2013-2016/CTM2013-48967
dc.relation	MINECO/PN2013-2016/CTM2016-78798
dc.relation.isformatof	Versió postprint del document publicat a: https://doi.org/10.1016/j.foodchem.2017.07.040
dc.relation.ispartof	Food Chemistry, 2018, vol. 239, p. 1143-1150
dc.rights	cc-by-nc-nd, (c) Elsevier, 2017
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject	Donnan Membrane Technique
dc.subject	Absence of Gradients and Nernstian Equilibrium Stripping
dc.subject	Zinc
dc.subject	Iron
dc.subject	Wine
dc.title	Speciation of Zn, Fe, Ca and Mg in wine with the Donnan Membrane Technique
dc.type	info:eu-repo/semantics/article
dc.date.updated	2018-09-14T07:03:31Z
dc.identifier.idgrec	025943
dc.type.version	info:eu-repo/semantics/acceptedVersion
dc.rights.accessRights	info:eu-repo/semantics/openAccess
dc.identifier.doi	https://doi.org/10.1016/j.foodchem.2017.07.040

Speciation of Zn, Fe, Ca and Mg in wine with the Donnan Membrane Technique

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