Giannakas Aris E, Salmas Constantinos E, Moschovas Dimitrios, Baikousi Maria, Kollia Eleni, Tsigkou Vasiliki, Karakassides Anastasios, Leontiou Areti, Kehayias George, Avgeropoulos Apostolos, Proestos Charalampos
Department of Food Science and Technology, University of Patras, 30100 Agrinio, Greece.
Department of Material Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.
Nanomaterials (Basel). 2022 May 27;12(11):1843. doi: 10.3390/nano12111843.
The global turn from the linear to the circular economy imposes changes in common activities such as food packaging. The use of biodegradable materials such as polyvinyl alcohol, natural raw materials such as clays, and food byproducts such as chitosan to develop novel food packaging films attracts the interest of industrial and institutional research centers. In this study, novel hybrid nanostructures were synthesized via the growth of zinc oxide nanorods on the surface of two nanoclays. The obtained nanostructures were incorporated with chitosan/polyvinyl alcohol composite either as nanoreinforcement or as an active agent to develop packaging films. The developed films were characterized via XRD, FTIR, mechanical, water-vapor diffusion, water sorption, and oxygen permeability measurements. Antimicrobial activity measurements were carried out against four different pathogen microorganisms. XRD indicated the formation of an intercalated nanocomposite structure for both types of nanoclays. Furthermore, improved tensile, water/oxygen barrier, and antimicrobial properties were recorded for all films compared to the pure chitosan/polyvinyl alcohol film. Overall, the results indicated that the use of the bio-based developed films led to an extension of food shelf life and could be used as novel active food packaging materials. Among them, the most promising film was the 6% wt. ZnO@halloysite.
全球从线性经济向循环经济的转变促使食品包装等常见活动发生变革。使用可生物降解材料(如聚乙烯醇)、天然原料(如黏土)以及食品副产品(如壳聚糖)来开发新型食品包装薄膜,引发了工业和机构研究中心的兴趣。在本研究中,通过在两种纳米黏土表面生长氧化锌纳米棒合成了新型混合纳米结构。所获得的纳米结构以纳米增强剂或活性剂的形式与壳聚糖/聚乙烯醇复合材料结合,以开发包装薄膜。通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、力学性能、水蒸气扩散、水吸附和氧气渗透性测量对所开发的薄膜进行了表征。对四种不同的病原微生物进行了抗菌活性测量。XRD表明两种类型的纳米黏土均形成了插层纳米复合结构。此外,与纯壳聚糖/聚乙烯醇薄膜相比,所有薄膜的拉伸性能、水/氧气阻隔性能和抗菌性能均有所改善。总体而言,结果表明使用生物基开发的薄膜可延长食品保质期,并可作为新型活性食品包装材料使用。其中,最有前景的薄膜是6%重量比的ZnO@埃洛石。
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