To maintain the quality of postharvest fruits continuously and meet the health requirements of consumers, a high barrier and long-lasting antibacterial polylactic acid film as packaging material was developed in this study. Polylactic acid-based antibacterial films incorporated with Cinnamaldehyde inclusions were used to achieve long-lasting antibacterial activity and improve the barrier properties. Cinnamaldehyde inclusions were prepared via the inclusion method and used as a sustained-release antibacterial agent and reinforcement to be incorporated into polylactic acid-based films within a concentration range of 0–30 wt%. The FT-IR spectrum demonstrated that the Cinnamaldehyde inclusions was physically interacting with PLA. The XRD results showed that the cinnamaldehyde inclusions at a concentration of 10 wt% enhanced the crystallinity of the antibacterial film. The oxygen and water vapor barrier properties of the film were respectively 14.29% and 12.38% higher than those of a pure PLA film. The tensile strength of the antibacterial film increased by 20%. And the antibacterial activity against Escherichia coli and Listeria monocytogenes was 100%. The release rate of cinnamaldehyde of the antibacterial film was slow and varied smoothly for 20 d.

为了持续保持采后水果的质量并满足消费者的健康要求，本研究开发了一种高阻隔和长效的抗菌聚乳酸薄膜作为包装材料。掺有肉桂醛夹杂物的基于聚乳酸的抗菌膜可实现持久的抗菌活性并改善阻隔性能。肉桂醛包合物是通过包合物方法制备的，并用作缓释抗菌剂和增强剂，并以0-30 wt％的浓度掺入聚乳酸基薄膜中。FT-IR光谱表明肉桂醛夹杂物与PLA发生物理相互作用。XRD结果表明，浓度为10重量％的肉桂醛夹杂物增强了抗菌膜的结晶度。该膜的氧气和水蒸气阻隔性能分别比纯PLA膜高14.29％和12.38％。抗菌膜的拉伸强度提高了20％。以及对大肠杆菌和单核细胞增生李斯特菌为100％。抗菌膜中肉桂醛的释放速率缓慢且在20 d内变化平稳。