Center of Chemistry, Chemistry Department, University of Minho, Campus de Gualtar, Braga 4710-057, Portugal.
Center of Chemistry, Chemistry Department, University of Minho, Campus de Gualtar, Braga 4710-057, Portugal; CITAB (Center for the Research and Technology of Agro-Environmental and Biological Sciences), Biology Department, University of Minho, Campus de Gualtar, Braga 4710-057, Portugal.
Colloids Surf B Biointerfaces. 2016 Jun 1;142:141-147. doi: 10.1016/j.colsurfb.2016.02.042. Epub 2016 Feb 22.
Different loadings of silver exchanged on bimetallic Zn/Ag-NaY zeolite materials were studied for antimicrobial properties against four reference microorganisms. The sensitive indicator strains used were two bacteria (Escherichia coli and Bacillus subtilis) and two yeast species (Saccharomyces cerevisiae and Candida albicans). The bimetallic materials were compared with the monometallic materials prepared with the same concentrations of silver. A synergistic effect between the two metals, zinc and silver, was evidenced on the antimicrobial activity of the materials. All mono and bimetallic materials showed strong efficacy against bacteria and yeasts, although the later overall displayed lower MIC values. The results of X-ray photoelectron spectroscopy (XPS) confirm the presence of silver and zinc as ions, not homogeneously distributed throughout the zeolite framework, which implies that the metal ions are located in different sites of the faujasite structure.
研究了负载不同银量的双金属 Zn/Ag-NaY 沸石材料对四种参考微生物的抗菌性能。使用的敏感指示菌株是两种细菌（大肠杆菌和枯草芽孢杆菌）和两种酵母（酿酒酵母和白色念珠菌）。将双金属材料与用相同浓度银制备的单金属材料进行了比较。两种金属锌和银在材料的抗菌活性上表现出协同作用。所有单金属和双金属材料对细菌和酵母均显示出很强的功效，尽管后者的 MIC 值总体上较低。X 射线光电子能谱（XPS）的结果证实了银和锌以离子形式存在，而不是均匀分布在沸石骨架中，这意味着金属离子位于方钠石结构的不同位置。
