纳米氧化镁增强聚乳酸生物膜在食品包装中的应用。
Nano-magnesium oxide reinforced polylactic acid biofilms for food packaging applications.
机构信息
Mechanical Engineering Department, Motilal Nehru National Institute of Technology, Allahabad, India.
Mechanical Engineering Department, Motilal Nehru National Institute of Technology, Allahabad, India; School of Mechanical and Aerospace Engineering, Faculty of Engineering and Physical Sciences, Queen's University, Belfast, UK.
出版信息
Int J Biol Macromol. 2018 Jul 1;113:729-736. doi: 10.1016/j.ijbiomac.2018.02.156. Epub 2018 Feb 27.
This study is aimed at producing biofilms by reinforcement of Magnesium Oxide (MgO) nanoparticles in polylactic acid (PLA) biopolymer using the solvent casting method. In this study MgO nanoparticles (up to 4wt%) were reinforced in PLA biopolymer and their key mechanical, barrier, thermal and antibacterial properties were investigated for food packaging applications. Among the prepared biocomposite films, the 2wt% reinforced PLA films showed the maximum improvement in tensile strength and oxygen barrier properties (up to 29% and 25% respectively) in comparison to pristine PLA films. However, the water vapor barrier properties decreased by nearly 25% due to interfacial behavior and presence of free volumes near MgO nanoparticles. PLA/MgO films also exhibited superior antibacterial efficacy. The 2wt% biofilms caused progressive damage and death of nearly 46% of E. coli bacterial culture after 12h treatment. The produced films are transparent, capable of screening UV radiations and exhibit superior antibacterial efficacy making them an excellent food packaging material.
本研究旨在通过溶剂浇铸法在聚乳酸（PLA）生物聚合物中增强氧化镁（MgO）纳米粒子来制备生物膜。在这项研究中，将高达 4wt%的 MgO 纳米粒子增强到 PLA 生物聚合物中，并研究了它们在食品包装应用中的关键机械、阻隔、热和抗菌性能。在所制备的生物复合材料薄膜中，与原始 PLA 薄膜相比，2wt%增强 PLA 薄膜的拉伸强度和氧气阻隔性能分别提高了高达 29%和 25%。然而，由于界面行为和 MgO 纳米粒子附近的自由体积的存在，水蒸气阻隔性能下降了近 25%。PLA/MgO 薄膜还表现出优异的抗菌功效。在 12 小时的处理后，2wt%的生物膜导致大肠杆菌细菌培养物的近 46%的逐渐损伤和死亡。所制备的薄膜透明，能够屏蔽紫外线辐射，并且具有优异的抗菌功效，使其成为一种极好的食品包装材料。
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