In this study, two modified silica nanoparticles (SiO₂-GA NPs) were successfully obtained by covalently grafting gallic acid onto silica nanoparticles. The mean particle diameters of their were 112.7±0.55 nm (1-SiO₂-GA NPs) and 408.7±3.20 nm (4-SiO₂-GA NPs), respectively. Novel antioxidant active packaging composite films were prepared by incorporation of 1-SiO₂-GA NPs or 4-SiO₂-GA NPs into chitosan. The structure analysis of the composite films showed that intermolecular hydrogen bonds were formed between the two modified silica nanoparticles and chitosan. Compared with the chitosan film, the mechanical properties, water vapor barrier property and UV light barrier ability of the composite films were significantly improved. Moreover, the incorporated of the two modified silica nanoparticles significantly increased antioxidant activity of the composite films. This study indicates that composite films incorporated with modified silica nanoparticles, especially the incorporation of 1-SiO₂-GA NPs can be used as novel antioxidant food packaging composite films.

在本研究中，通过将没食子酸共价接枝到二氧化硅纳米粒子上，成功获得了两种改性二氧化硅纳米粒子（SiO ₂ -GA NPs）。它们的平均粒径分别为112.7±0.55 nm（1-SiO ₂ -GA NPs）和408.7±3.20 nm（4-SiO ₂ -GA NPs）。通过掺入1-SiO ₂ -GA NPs或4-SiO ₂制备新型抗氧化活性包装复合膜-GA NPs 转化为壳聚糖。复合薄膜的结构分析表明，两种改性二氧化硅纳米粒子与壳聚糖之间形成了分子间氢键。与壳聚糖薄膜相比，复合薄膜的力学性能、水蒸气阻隔性能和紫外线阻隔能力均有显着提高。此外，两种改性二氧化硅纳米粒子的掺入显着提高了复合膜的抗氧化活性。该研究表明，掺入改性二氧化硅纳米粒子的复合膜，尤其是掺入1-SiO ₂ -GA NPs 的复合膜可用作新型抗氧化食品包装复合膜。