目的 研究纳米木质素对壳聚糖基薄膜性能和抗菌效果的影响，旨在推动功能生物基薄膜的发展应用。方法 以植酸改性酶解木质素为纳米功能相，羧甲基壳聚糖(CMCh)为成膜基材，通过静电作用制备不同浓度纳米木质素的复合薄膜，并测试复合薄膜的微观结构、机械性能、抗氧化性能、光学性能、热性能和光热杀菌性能。结果 木质素纳米颗粒在CMCh膜中均匀分布。随着纳米木质素添加量的增加，复合薄膜的断裂伸长率和拉伸强度先升高后降低，当纳米木质素质量分数为10%时，复合薄膜的拉伸强度提高约145%，断裂伸长率提高约30%。此外，纳米木质素的引入赋予复合薄膜优异的抗紫外(UV)、抗氧化和光热抗菌性能。结论 该纳米复合薄膜表现出优异的机械性能和光热抗菌性能，为开发功能型生物基塑料包装材料及抗菌食品包装提供了新思路。

The work aims to investigate the effects of nanolignin on the properties and antibacterial activity of chitosan-based films, with the aim of advancing the development and application of functional bio-based films. With phytic acid-modified enzymatically hydrolyzed lignin as the nanoscale functional phase, and carboxymethyl chitosan (CMCh) as the film-forming matrix, the composite films with varying concentrations of nanolignin were prepared via electrostatic interactions. The microstructure, mechanical properties, antioxidant capacity, optical properties, thermal stability, and photothermal antibacterial performance of the films were systematically evaluated. The lignin nanoparticles were uniformly dispersed within the CMCh matrix. As the nanolignin content increased, the tensile strength and elongation at break of the composite films initially increased and then decreased. At a nanolignin content of 10%, the tensile strength increased by approximately 145%, and the elongation at break increased by about 30%. Moreover, the incorporation of nanolignin endowed the composite films with excellent UV resistance, antioxidant capacity, and photothermal antibacterial activity. These nanocomposite films exhibit superior mechanical and photothermal antibacterial properties, providing new insights for the development of functional bio-based plastic packaging materials and antibacterial food packaging.