Speciation of Zn, Fe, Ca and Mg in wine with the Donnan Membrane Technique
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...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10459.1/64708 |
| Acceso en línea: | https://doi.org/10.1016/j.foodchem.2017.07.040 http://hdl.handle.net/10459.1/64708 |
| Access Level: | acceso abierto |
| Palabra clave: | Donnan Membrane Technique Absence of Gradients and Nernstian Equilibrium Stripping Zinc Iron Wine |
| Sumario: | 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. |
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