Department of Chemistry, Faculty of Sciences, University of Navarra, 31008 Pamplona, Spain.
Department of Chemistry, Faculty of Sciences, University of Navarra, 31008 Pamplona, Spain.
Int J Biol Macromol. 2022 Sep 1;216:347-360. doi: 10.1016/j.ijbiomac.2022.06.202. Epub 2022 Jul 4.
Polylactic acid (PLA) and cellulose acetate (CA) as biodegradable polymers are being highly exploited in the development of innovative materials across several industrial sectors. PLA and CA composite films with TiO nanoparticles (NPs) and β-cyclodextrin grafted TiO NPs were prepared. Thermo- and photo-degradation studies were performed on PLA and CA films and noticed that higher amount of TiO induce greater color variations, structure modifications and weight losses. It has been observed 9.3 % and 5.1 % maximum weight loss for 5 % TiO CA and PLA matrices, respectively. βCD-modified TiO NPs increased the photo-degradation of the plain polymers to a lesser extent than TiO NPs. Benzoic acid (BA) and sorbic acid (SA) were incorporated to βCD-TiO NPs and the antibacterial activity of PLA and CA composite films was studied by inactivation of Escherichia coli and Staphylococcus aureus. CA film filled with 5 % TiO NPs presented the highest antibacterial activity and achieved 71 % inhibition of E. coli and 88 % inhibition of S. aureus. CA composite films showed potential to be used as antimicrobial food packaging.
聚乳酸（PLA）和醋酸纤维素（CA）作为可生物降解聚合物，正在被广泛应用于多个工业领域的创新材料的开发。制备了含有 TiO2 纳米粒子（NPs）和β-环糊精接枝 TiO2 NPs 的 PLA 和 CA 复合薄膜。对 PLA 和 CA 薄膜进行了热和光降解研究，结果表明，TiO2 的含量越高，颜色变化、结构修饰和重量损失越大。在 5%的 CA 和 PLA 基质中，分别观察到最大 9.3%和 5.1%的重量损失。βCD 修饰的 TiO2 NPs 对纯聚合物的光降解的促进作用小于 TiO2 NPs。将苯甲酸（BA）和山梨酸（SA）掺入到βCD-TiO2 NPs 中，并研究了 PLA 和 CA 复合薄膜的抗菌活性，以评估其对大肠杆菌和金黄色葡萄球菌的灭活效果。填充有 5%TiO2 NPs 的 CA 薄膜表现出最高的抗菌活性，对大肠杆菌的抑制率达到 71%，对金黄色葡萄球菌的抑制率达到 88%。CA 复合薄膜具有作为抗菌食品包装的潜力。
