Lao Mireia, Companys Encarnació, Weng Liping, Puy Jaume, Galceran Josep
Departament de Química, Universitat de Lleida and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Spain.
Departament de Química, Universitat de Lleida and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Spain.
Food Chem. 2018 Jan 15;239:1143-1150. doi: 10.1016/j.foodchem.2017.07.040. Epub 2017 Jul 11.
Free concentrations of Zn, Fe, Ca and Mg 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 1.76μmolL 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), 1.7μmolL, amounting to 14.4% of the total Zn. The free concentrations found in this wine were 1.79μmolL Fe, 1.11mmolL Ca and 3.4mmolLMg (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.
首次采用唐南膜技术（DMT）测定了一种红葡萄酒（来自西班牙加泰罗尼亚的雷马特）中锌、铁、钙和镁的游离浓度。所需的平衡时间得益于包含主要阳离子的受体溶液。钾和钠在样品中主要未与任何配体结合，已被确定为合适的参比离子。用DMT测定的游离锌浓度为1.76μmol/L，与电化学分析技术“无梯度和能斯特平衡溶出法”（AGNES）独立提供的游离锌浓度1.7μmol/L高度吻合，占总锌含量的14.4%。该葡萄酒中测得的游离浓度分别为：铁1.79μmol/L、钙1.11mmol/L和镁3.4mmol/L（分别占其总浓度的8.82%、40%和57%）。在将这些技术应用于红葡萄酒之前，已在酒石酸锌溶液中对其进行了交叉验证。
