Due to the environmental problems caused by the use of synthetic plastics in food packaging, it is necessary to replace them with biodegradable films. In this study, carboxyl methyl cellulose/gelatin composite modified with TiO₂–Ag nanoparticles (CMC/Gel/TiO₂–Ag) was prepared and its antioxidant, antimicrobial, mechanical, colorimetric and morphological characteristics were investigated. To evaluate the effect of gelatin percent and TiO₂–Ag percentage on the film properties, a central composite design (CCD) was used. The morphology of the films was investigated by the scanning electron microscopy (SEM). SEM results showed that TiO₂–Ag nanoparticles in the range of 50–100 nm were distributed among CMC polymers and gelatin. The antioxidant properties of the film showed that nanoparticles have anti-oxidant properties and can be very effective in preparing antioxidant films. The microbial test indicates antimicrobial activity of nanoparticles against Gram-negative bacteria (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. According to the mechanical results, gelatin increases the film elasticity. TiO₂–Ag increases the elongation and extension of CMC film and adding of gelatin to the CMC film decrease these parameters. Adding TiO₂–Ag to the film increases the maximum force to break the film (F_max), but adding gelatin to the film decreases the F_max. Colorimetric results showed that gelatin increased transparency and TiO₂–Ag reduced the transparency. According to the results, the simultaneous increase of gelatin and TiO₂–Ag, increases a* parameter. With increasing TiO₂–Ag nanoparticles, the whiteness index increased. The overall results obtained from this study show that, given the antimicrobial and antioxidant properties of silver and titanium dioxide and antioxidant properties of gelatin, the CMC/Gel/TiO₂–Ag film has a very important antimicrobial and antioxidant properties and can be used as an active/antioxidant packaging system.

由于在食品包装中使用合成塑料引起的环境问题，有必要用可生物降解的薄膜代替它们。本研究制备了以TiO ₂ -Ag纳米粒子（CMC / Gel / TiO ₂ -Ag）改性的羧甲基纤维素/明胶复合材料，并研究了其抗氧化，抗微生物，力学，比色和形态特征。为了评估明胶百分比和TiO ₂ -Ag百分比对薄膜性能的影响，使用了中央复合设计（CCD）。通过扫描电子显微镜（SEM）研究了膜的形态。SEM结果表明TiO ₂在50-100 nm范围内的–Ag纳米颗粒分布在CMC聚合物和明胶中。膜的抗氧化性能表明，纳米颗粒具有抗氧化性能，可以非常有效地制备抗氧化膜。微生物测试表明纳米颗粒对革兰氏阴性菌（大肠杆菌）和革兰氏阳性菌（金黄色葡萄球菌）具有抗菌活性。根据机械结果，明胶可增加薄膜的弹性。TiO ₂ -Ag可增加CMC膜的伸长率和延伸率，而向CMC膜中添加明胶可降低这些参数。在薄膜中添加TiO ₂ -Ag会增加最大破坏力（F _max），但在薄膜中加入明胶会降低F _max。比色法结果表明，明胶提高了透明度，而TiO ₂ -Ag降低了透明度。根据结果​​，明胶和TiO ₂ -Ag的同时增加，增加了a *参数。随着TiO ₂ -Ag纳米颗粒的增加，白度指数增加。从这项研究中获得的总体结果表明，鉴于银和二氧化钛的抗菌和抗氧化特性以及明胶的抗氧化特性，CMC / Gel / TiO ₂ -Ag膜具有非常重要的抗菌和抗氧化特性，可以用作活性/抗氧化剂包装系统。