Department of Comparative Biomedicine and Food Science, University of Padua, Italy.
Department of Comparative Biomedicine and Food Science, University of Padua, Italy; Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry and Experimental Physics, Palacky University, Olomouc, Czech Republic.
Food Chem. 2018 Nov 30;267:430-436. doi: 10.1016/j.foodchem.2017.06.109. Epub 2017 Jun 24.
An innovative core-shell nanocarrier, combining the magnetism of surface active maghemite nanoparticles (SAMNs, the core) and tannic acid (TA, the shell) was self-assembled by simple incubation in water. Due to the drastic reorganization of SAMN surface, the prepared magnetic nanocarrier (SAMN@TA) resulted as one of the most robust nanomaterial bearing TA to date. Nevertheless, the ferric tannates network, constituting the SAMN@TA shell, and the free tannic acid display comparable chemical behavior. The antimicrobial properties of SAMN@TA were tested on Listeria monocytogenes in comparison with free TA, showing similar bacteriostatic effects at relatively low concentrations. Besides the preservation of the TA inhibitory activity toward L. monocytogenes, the possibility of being magnetically removed leaving no residues into the matrix makes this nanocarrier an innovative processing aid for surface treatments. Thus, SAMN@TA can be used as an effective, low-cost and environmentally friendly antimicrobial nanomaterial for the food industry applications.
一种创新性的核壳纳米载体，通过简单地在水中孵育，将表面活性磁铁矿纳米粒子（SAMN，核）和鞣酸（TA，壳）的磁性结合在一起。由于 SAMN 表面的剧烈重组，所制备的磁性纳米载体（SAMN@TA）成为迄今为止具有 TA 的最坚固的纳米材料之一。然而，构成 SAMN@TA 壳的铁鞣酸盐网络和游离鞣酸表现出类似的化学行为。SAMN@TA 的抗菌性能在单核细胞增生李斯特菌上进行了测试，并与游离 TA 进行了比较，在相对较低的浓度下显示出相似的抑菌效果。除了保留 TA 对单核细胞增生李斯特菌的抑制活性外，还可以通过磁性去除，使纳米载体在基质中不残留任何残留物，这使得该纳米载体成为表面处理的一种创新性加工助剂。因此，SAMN@TA 可用作食品工业应用的有效、低成本和环保型抗菌纳米材料。
