Faculty of Chemical and Petroleum Engineering, Univ. of Tabriz, Tabriz, Iran.
Dept. of Food Science, College of Agriculture, Univ. of Tabriz, Tabriz, Iran.
J Food Sci. 2019 Sep;84(9):2537-2548. doi: 10.1111/1750-3841.14744. Epub 2019 Aug 21.
In this study, silver (Ag), zinc oxide (ZnO), and copper oxide (CuO) metallic nanoparticles were used in preparation of carboxymethyl cellulose (CMC) nanobiocomposite films. Scanning electron microscopy (SEM), X-ray diffraction (EDXA), water vapor permeability (WVP), ultraviolet and visible light (UV-Vis) spectroscopy, and mechanical and microbial tests were used to determine the characteristics of the obtained active films. SEM results showed that the CMC nanobiocomposite films had roughness deflection levels and the EDXA test confirmed the presence of Ag, ZnO, and Cuo nanoparticles in the biopolymer tissue. UV-Vis spectroscopy confirmed that with addition of metallic nanoparticles to the pure CMC film, absorption rate increased and WVP decreased. In the mechanical tests, addition of nanoparticles also increased the tensile strength of the films, and the nanobiocomposite films exhibited higher resistance compared to the pure CMC film. Films incorporating metallic nanoparticles showed antibacterial properties against Escherichia coli and Staphylococcus aureus growth. Thus, nanobiocomposite films can be used as active packaging films and could increase the shelf-life of the food.
在这项研究中，使用了银（Ag）、氧化锌（ZnO）和氧化铜（CuO）金属纳米粒子来制备羧甲基纤维素（CMC）纳米生物复合材料薄膜。扫描电子显微镜（SEM）、X 射线衍射（EDXA）、水蒸气透过率（WVP）、紫外可见分光光度计（UV-Vis）光谱、机械和微生物测试用于确定所得活性膜的特性。SEM 结果表明，CMC 纳米生物复合材料薄膜具有粗糙度挠度水平，EDXA 测试证实了 Ag、ZnO 和 Cuo 纳米粒子存在于生物聚合物组织中。UV-Vis 光谱证实，向纯 CMC 薄膜中加入金属纳米粒子会增加吸收率并降低 WVP。在机械测试中，添加纳米粒子也提高了薄膜的拉伸强度，与纯 CMC 薄膜相比，纳米生物复合材料薄膜具有更高的阻力。含有金属纳米粒子的薄膜对大肠杆菌和金黄色葡萄球菌的生长表现出抗菌性能。因此，纳米生物复合材料薄膜可用作活性包装薄膜，并可以延长食品的保质期。
