University of Maribor, Faculty of Mechanical Engineering, Laboratory for Characterization and Processing of Polymers, Smetanova 17, SI-2000 Maribor, Slovenia.
Jožef Stefan Institute, Department of Surface Engineering and Optoelectronics, Teslova 30, SI-1000 Ljubljana, Slovenia.
Int J Mol Sci. 2020 Jan 13;21(2):495. doi: 10.3390/ijms21020495.
In this research, antimicrobial polysaccharide chitosan was used as a surface coating for packaging material. The aim of our research was to establish an additive formulation of chitosan and antioxidative plant extracts as dispersion of nanoparticles. Chitosan nanoparticles with embedded thyme, rosemary and cinnamon extracts were synthesized, and characterized for this purpose. Two representative, commercially used foils, polypropylene (PP) and polyethylene (PE), previously activated by UV/ozone to improve coating adhesion, were functionalized using chitosan-extracts nanoparticle dispersions. The foils were coated by two layers. A solution of macromolecular chitosan was applied onto foils as a first layer, followed by the deposition of various extracts embedded into chitosan nanoparticles that were attached as an upper layer. Since active packaging must assure bioactive efficiency at the interface with food, it is extremely important to understand the surface characteristics and phenomena of functionalized foils. The physico-chemical analyses of functionalized foils were thus comprised of surface elemental composition, surface charge, wettability, as well as surface morphology. It has been shown that coatings were applied successfully with an elemental composition, surface charge and morphology that should enable coating stability, homogeneity and consequently provide an active concept of the packaging surface in contact with food. Moreover, the wettability of foils was improved in order to minimize the anti-fogging behavior.
在这项研究中，抗菌多糖壳聚糖被用作包装材料的表面涂层。我们研究的目的是建立壳聚糖和抗氧化植物提取物作为纳米颗粒分散体的添加剂配方。为此，合成了嵌入百里香、迷迭香和肉桂提取物的壳聚糖纳米颗粒，并对其进行了表征。为了提高涂层附着力，对两种具有代表性的商业用箔材，即聚丙烯（PP）和聚乙烯（PE），进行了 UV/臭氧预处理。用壳聚糖-提取物纳米颗粒分散体对箔材进行功能化处理，涂覆两层。将高分子壳聚糖溶液涂覆在箔材上作为第一层，然后将嵌入壳聚糖纳米颗粒中的各种提取物沉积在箔材上作为上层。由于活性包装必须确保在与食品的界面处具有生物活性效率，因此了解功能化箔材的表面特性和现象极其重要。因此，对功能化箔材进行了物理化学分析，包括表面元素组成、表面电荷、润湿性以及表面形态。结果表明，涂层的应用非常成功，其元素组成、表面电荷和形态应能确保涂层的稳定性、均一性，并因此为与食品接触的包装表面提供了一种活性概念。此外，还改善了箔材的润湿性，以尽量减少防雾行为。
