Barbosa Maciel L, Oliveira Leticia M de, Paiva Robert, Dametto Alessandra C, Dias Diogenes Dos S, Ribeiro Clovis A, Wrona Magdalena, Nerín Cristina, Barud Hernane da S, Cruz Sandra A
Department of Chemistry, Federal University of São Carlos (UFSCar), São Carlos 13565-905, Brazil.
Department of Physics, Federal University of the São Francisco Valley (UNIVASF), Petrolina 56300-000, Brazil.
Molecules. 2023 Sep 27;28(19):6829. doi: 10.3390/molecules28196829.
Agro-industrial residues have attracted attention for their applications in the field of biodegradable packaging. Recently, our research group has developed onion-based films with promising properties for this type of application due to their non-toxicity, biocompatibility and biodegradability. Therefore, in this study, we investigated the effect of Laponite clay concentration on the physicochemical and antioxidant properties of the onion-based films, which were prepared by a casting method. The XRD and FTIR data confirm the presence of the mineral clay in the onion-based films. These findings are consistent with those obtained from FE-SEM analysis, which revealed the presence of typical Laponite grains. In terms of wettability, the results show that the clay decreases the hydrophilic character of the material but slightly increases the water vapor permeation. Optical characterization revealed that the materials exhibited zero transmittance in the UV region and increased opacity in the visible region for composites containing 5% and 10% Laponite. Furthermore, the antioxidant test demonstrated higher antioxidant potential in the composites compared to the pure films. Consequently, these results suggest that the formation of Laponite and onion composites could be an essential strategy for developing natural polymers in the field of food contact packaging.
农用工业残渣因其在可生物降解包装领域的应用而受到关注。最近，我们的研究小组开发了基于洋葱的薄膜，由于其无毒、生物相容性和可生物降解性，在这类应用中具有良好的性能。因此，在本研究中，我们研究了锂皂石粘土浓度对通过流延法制备的基于洋葱的薄膜的物理化学和抗氧化性能的影响。XRD和FTIR数据证实了基于洋葱的薄膜中存在矿物粘土。这些发现与FE-SEM分析结果一致，FE-SEM分析显示存在典型的锂皂石颗粒。在润湿性方面，结果表明粘土降低了材料的亲水性，但略微增加了水蒸气透过率。光学表征表明，对于含有5%和10%锂皂石的复合材料，材料在紫外区域表现出零透过率，在可见光区域不透明度增加。此外，抗氧化测试表明，与纯薄膜相比，复合材料具有更高的抗氧化潜力。因此，这些结果表明，锂皂石与洋葱复合材料的形成可能是在食品接触包装领域开发天然聚合物的一项重要策略。
