目的 制备兼具阻隔、抗氧化和抑菌功能的半纤维素基活性包装复合膜,解决半纤维素基包装膜阻隔性不足,功能单一的问题。方法 以半纤维素为原料,经羧甲基化改性后与聚乙烯醇共混成膜,引入绿茶碳点（GT-CDs）和Fe3+构建协同增强复合膜体系,探究GT-CDs负载与Fe3+对半纤维素/聚乙烯醇复合膜的微观结构调控及其阻隔性能、抗氧化活性和抗菌性能的影响。结果 GT-CDs呈类球形,粒径小于5 nm,具有较强紫外吸收能力和激发依赖荧光特征,并对大肠杆菌和金黄色葡萄球菌表现出良好抑制作用,抑菌圈直径分别为22.34 mm和21.3 mm。当GT-CDs添加量（质量分数）为2%时,复合膜的DPPH自由基清除率为86.65%,进一步加入质量分数为1%的Fe3+后,DPPH自由基清除率提高至89.64%,抑菌率达到100%。与半纤维素/聚乙烯醇膜相比,掺杂GT-CDs和Fe3⁺的复合膜的氧气透过率和水蒸气透过率分别为5.268 cm3/(m2·d·0.1 MPa)和30.63 g/(m2·24 h),分别降低了43.8%和53.1%。结论 GT-CDs与Fe3+通过配位络合和界面协同作用促进复合膜形成致密的内部结构并优化传质路径,同时赋予其自由基清除和抑菌功能,从而实现半纤维素/聚乙烯醇复合膜的阻隔性、抗氧化性和抑菌性的同步提升。
Abstract
The work aims to develop hemicellulose-based active packaging composite films with barrier, antioxidant and antibacterial functions to overcome the poor barrier property and limited functionality of conventional hemicellulose-based packaging films. Hemicellulose was first subject to carboxymethylation modification and then blended with PVA to form the base film matrix. Green tea carbon dots (GT-CDs) and Fe3+ were incorporated to establish a synergistically enhanced composite system. The effects of GT-CDs loading content and Fe3+ addition on the microstructure evolution, barrier property, antioxidant activity and antibacterial efficacy of the resulting film were systematically evaluated. The GT-CDs displayed a quasi-spherical morphology with diameters below 5 nm, strong ultraviolet absorption capacity and excitation-dependent fluorescence behaviors. They exhibited remarkable inhibitory effects against both Escherichia coli and Staphylococcus aureus, with inhibition zone diameters of 22.34 mm and 21.3 mm, respectively. At a GT-CDs loading of 2 wt%, the composite film achieved a DPPH radical scavenging rate of 86.65%. With the additional incorporation of 1 wt% Fe3+, the DPPH radical scavenging rate further increased to 89.64%, and a complete antibacterial effect (100% inhibition rate) was obtained. Compared with the hemicellulose/PVA film, the composite film co-doped with GT-CDs and Fe3+ exhibited oxygen permeability of 5.268 cm³/(m²·d·0.1 MPa) and water vapor permeability of 30.63 g/(m2·24 h), representing reductions of 43.8% and 53.1%, respectively. The synergistic effects between GT-CDs and Fe3+, including coordination complexation and interfacial interactions, facilitate the formation of a dense internal structure and optimize the mass transfer pathways within the composite film. Meanwhile, they endow the film with excellent free radical scavenging and antibacterial capabilities, leading to the simultaneous enhancement of barrier, antioxidant and antibacterial properties of the hemicellulose /PVA composite film. KEY WORDS: hemicellulose; green tea carbon dots; antioxidant; packaging film
关键词
半纤维素 /
绿茶碳点 /
抗氧化 /
包装膜
Key words
hemicellulose /
green tea carbon dots /
antioxidant /
packaging film
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基金
国家重点研发计划（2023YFF1105205）
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