Becaro Aline A, Puti Fernanda C, Correa Daniel S, Paris Elaine C, Marconcini José M, Ferreira Marcos D
J Nanosci Nanotechnol. 2015 Mar;15(3):2148-56. doi: 10.1166/jnn.2015.9721.
This paper reports the antibacterial effect and physico-chemical characterization of films containing silver nanoparticles for use as food packaging. Two masterbatches (named PEN and PEC) con- taining silver nanoparticles embedded in distinct carriers (silica and titanium dioxide) were mixed with low-density polyethylene (LDPE) in different compositions and extruded to produce plain films. These films were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TGA) and Fourier Transform Infrared Spectroscopy (FTIR). The morphology of the films showed the formation of agglomerates of nanoparticles in both PEN and PEC composites. X-ray analyses confirmed the presence of SiO2 in PEN samples and TiO2 in PEC samples. Thermal analyses indicated an increase in thermal stability of the PEC compositions. The antimicrobial efficacy was determined by applying the test strain for Escherichia coli and Staphylococcus aureus, according to the Japanese Industrial Standard Method (JIS Z 2801:2000). The films analyzed showed antimicrobial properties against the tested microorganisms, presenting better activity against the S. aureus than E. Coli. These findings suggest that LDPE films with silver nanoparticles are promising to provide a significant contribution to the quality and safety of packaged food.
本文报道了含银纳米颗粒的薄膜作为食品包装材料的抗菌效果及物理化学特性。将两种分别含有嵌入不同载体（二氧化硅和二氧化钛）的银纳米颗粒的母料（分别命名为PEN和PEC）与低密度聚乙烯（LDPE）按不同比例混合并挤出，制成普通薄膜。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、差示扫描量热法（DSC）、热重分析（TGA）和傅里叶变换红外光谱（FTIR）对这些薄膜进行了表征。薄膜的形态显示，PEN和PEC复合材料中均形成了纳米颗粒团聚体。X射线分析证实PEN样品中存在SiO₂，PEC样品中存在TiO₂。热分析表明PEC组合物的热稳定性有所提高。根据日本工业标准方法（JIS Z 2801:2000），通过对大肠杆菌和金黄色葡萄球菌测试菌株进行测试来确定抗菌效果。所分析的薄膜对测试微生物具有抗菌性能，对金黄色葡萄球菌的活性优于大肠杆菌。这些研究结果表明，含银纳米颗粒的LDPE薄膜有望为包装食品的质量和安全做出重大贡献。
