School of Biosciences & Technology, VIT University, Vellore, Tamilnadu 632014, India.
Centre for Nanotechnology Research, VIT University, Vellore, Tamilnadu 632014, India.
IET Nanobiotechnol. 2020 Dec;14(9):809-814. doi: 10.1049/iet-nbt.2020.0100.
In the present work cassava starch/agar Ag and ZnO nanocomposite films were prepared by the solution casting method. The structural, physical and antimicrobial properties of the nanocomposite films were studied as a function of the concentration of Ag and ZnO nanoparticles. The results of the thermogravimetric analysis showed 8-15% degradation of both the nanocomposite films at 150°C endorsing the thermal stability of the films. Scanning electron microscopic analysis reveals the uniform blending of Ag and ZnO nanoparticles with a starch/agar matrix with tiny waves like appearance on the surface. The incorporation of Ag and ZnO nanoparticles in the film was found to reduce the moisture content, water solubility and water vapour permeability with increase in the concentration of Ag and ZnO nanoparticles. The growth kinetics study of in the presence of Ag and ZnO blended nanocomposite films showed promising results especially against Gram-negative Thus, the film synthesised in the present study bears the potential to be used as active packaging material to prevent food from bacterial contamination and spoilage.
本工作采用溶液浇铸法制备了木薯淀粉/琼脂 Ag 和 ZnO 纳米复合材料薄膜。研究了纳米复合材料薄膜的结构、物理和抗菌性能，作为 Ag 和 ZnO 纳米粒子浓度的函数。热重分析的结果表明，在 150°C 时，两种纳米复合材料薄膜都有 8-15%的降解，证明了薄膜的热稳定性。扫描电子显微镜分析表明，Ag 和 ZnO 纳米粒子与淀粉/琼脂基质均匀混合，表面呈现微小的波浪状。发现 Ag 和 ZnO 纳米粒子的掺入降低了薄膜的水分含量、水溶性和水蒸气透过率，随着 Ag 和 ZnO 纳米粒子浓度的增加而增加。在 Ag 和 ZnO 混合纳米复合材料薄膜存在下的生长动力学研究显示出有希望的结果，特别是对革兰氏阴性菌。因此，本研究中合成的薄膜有可能用作活性包装材料，以防止食品受到细菌污染和变质。
