School of Biosciences, Mahatma Gandhi University, P.D Hills (P.O), Kottayam, Kerala, 686 560, India.
School of Biosciences, Mahatma Gandhi University, P.D Hills (P.O), Kottayam, Kerala, 686 560, India.
Int J Biol Macromol. 2019 Oct 15;139:475-485. doi: 10.1016/j.ijbiomac.2019.07.187. Epub 2019 Jul 27.
The study reports a one-step preparation of polyvinyl alcohol/boiled rice starch blend film fabricated with in situ generated silver nanoparticles (PVA/BRS/sAgNPs) formed in the presence of sunlight irradiation. The bionanocomposite appeared to have dark brown color with a characteristic surface plasmon resonance peak at 439 nm. Further characterization has confirmed the presence of physical interactions among the components PVA, BRS and sAgNPs. Compared to the control PVA, the nanocomposites showed improved mechanical and optical properties with decreased water sensitivity. Presence of boiled rice starch and sAgNPs were also found to influence the light transmittance of composite film. Moreover, PVA/BRS/sAgNPs film was found to have superior barrier property against environmental microorganisms. Biodegradation of the composite films was studied by indoor soil burial test and was assessed by visual appearance, weight loss and FTIR analysis. Interestingly, both the PVA/BRS and PVA/BRS/sAgNPs films proved to be biodegradable and hence have promising application as cost effective food packaging material with the latter having marked antimicrobial property.
该研究报告了一种一步法制备聚乙烯醇/煮米淀粉共混膜，该膜是在阳光照射下原位生成银纳米粒子（PVA/BRS/sAgNPs）制备的。该生物纳米复合材料呈现深棕色，在 439nm 处有特征的表面等离子体共振峰。进一步的表征证实了 PVA、BRS 和 sAgNPs 之间存在物理相互作用。与对照的 PVA 相比，纳米复合材料表现出更好的机械和光学性能，同时对水的敏感性降低。煮米淀粉和 sAgNPs 的存在也影响了复合膜的透光率。此外，PVA/BRS/sAgNPs 薄膜对环境微生物具有优异的阻隔性能。通过室内土壤掩埋试验研究了复合薄膜的生物降解性，并通过外观、失重和 FTIR 分析进行了评估。有趣的是，PVA/BRS 和 PVA/BRS/sAgNPs 薄膜都被证明是可生物降解的，因此具有作为具有成本效益的食品包装材料的应用前景，后者具有显著的抗菌性能。
