College of Packaging and Material Engineering, Hunan University of Technology, Zhuzhou 412007, Hunan, China.
Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, Hunan, China.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1613-1621. doi: 10.1166/jnn.2020.17346.
Nano-composite films were developed between silver nanoparticles (Ag NPs) and a low-density polyethylene (LDPE) using master batches by melt extruding and melt compounding. The Ag/PE composite film showed decreased gas permeability, moisture permeability coefficient, the tear strength, the longitudinal and transverse elongation to that of commercial LDPE. Although stiffness increased at high Ag (40 ppm) concentration, but the longitudinal and transverse tensile strength enhance comparing with commercial PE. Light transmittance and haze were comparable. Both Nano-silver and composite films are effective against (). Antibacterial activity of nano-silver for was determined by diameter of the inhibition zone and the minimum inhibitory concentration of nano-silver is detected by tube double dilution method reaching 15.63 ppm. The composite films are effective inhibition of at concentrations of 40 ppm Ag nanoparticles. Moreover, Nano-silver migration occurs in composite film. One-side migration was conducted to detect under three food simulants (3% acetic acid, 50% ethanol and distilled water) at three degree of temperature (25 °C, 40 °C and 70 °C) on different period of time (2, 4, 6, 8, 10 and 12 hours). These results indicated that the highest migration amount was obtained with 3% acetic acid following distilled water and finally 50% ethanol under same conditions. The migration level is dependent upon time and temperature and high migration time and temperature can enhance migration level. These findings demonstrate that nano-silver-containing polyethylene composite film may have a great potential for developing antibacterial and acid food packaging system.
采用母粒熔融挤出和熔融共混的方法，在银纳米粒子（Ag NPs）和低密度聚乙烯（LDPE）之间制备了纳米复合膜。Ag/PE 复合膜的气体透过率、水蒸气透过系数、撕裂强度、纵向和横向伸长率均低于商用 LDPE。尽管在高 Ag（40ppm）浓度下刚性增加，但与商用 PE 相比，纵向和横向拉伸强度增强。透光率和雾度相当。纳米银和复合膜都对（）有效。通过抑菌圈直径和纳米银的最小抑菌浓度（用管双稀释法检测）来确定纳米银对（）的抗菌活性，达到 15.63ppm。复合膜在 40ppmAg 纳米粒子浓度下对（）有效抑制。此外，纳米银在复合膜中发生迁移。在三种食品模拟物（3%乙酸、50%乙醇和蒸馏水）下，在三种温度（25°C、40°C 和 70°C）和不同时间（2、4、6、8、10 和 12 小时）进行单侧迁移检测。结果表明，在相同条件下，迁移量最高的是 3%乙酸，其次是蒸馏水，最后是 50%乙醇。迁移水平取决于时间和温度，较高的迁移时间和温度可以提高迁移水平。这些发现表明，含纳米银的聚乙烯复合膜在开发抗菌和酸性食品包装系统方面具有很大的潜力。
