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| 负载茶多酚的壳聚糖/明胶抗菌复合膜构建及保鲜性能研究 |
| Development of tea polyphenol-loaded chitosan/gelatin antibacterial composite films and their preservation properties |
| 投稿时间：2026-02-23 修订日期：2026-08-15 |
| DOI： |
| 中文关键词: 壳聚糖 明胶 茶多酚 复合膜 保鲜 |
| 英文关键词:chitosan gelatin tea polyphenols composite films preservation |
| 基金项目:湖南省自然科学(2024JJ5189) |
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| 中文摘要: |
| 目的 以壳聚糖(chitosan, CS)、明胶(gelatin, GEL)为成膜基材，茶多酚(tea polyphenols, TP)为活性添加剂，制备一种具有抗菌功能的复合膜。方法 通过溶液共混流延成膜法制备不同TP添加量的CS/GEL复合膜，分析测定膜的含水量、水溶性、溶胀率、透光率、抗菌活性及对草莓的保鲜效果。结果 CS/GEL/TP复合膜外观平整，TP的引入优化了复合膜的性能，当TP添加量为1.5%时，复合膜综合性能最佳，紫外光透光率低至0.113%，对大肠杆菌(Escherichia coli)和金黄色葡萄球菌(Staphylococcus aureus)的抑菌率分别达73.34%和99.78%。草莓保鲜实验中，该复合膜有效抑制果实的重量损失，11 d后损失率低至15.27%，延缓了草莓的感官劣变，货架期延长了4 d。结论 适当添加TP的CS/GEL复合膜的含水量、水溶性、溶胀度、紫外光透光率及抗菌活性等性能得到提升，有效地延长了草莓的保存期，在水果保鲜领域具有一定的应用潜力。 |
| 英文摘要: |
| Objective To prepare a composite film with antibacterial function using chitosan (CS) and gelatin (GEL) as film-forming substrates and tea polyphenols (TP) as an active additive. Methods CS/GEL composite films with different TP additions were prepared by solution blending and casting method. The water content, water solubility, swelling degree, light transmittance, antibacterial activity, and preservation effect on strawberries of the films were analyzed and determined. Results The CS/GEL/TP composite films exhibited a smooth appearance. The introduction of TP optimized the properties of the composite films. When the TP addition was 1.5%, the composite film showed the best overall performance: the ultraviolet light transmittance was as low as 0.113%, and inhibition rates against Escherichia coli and Staphylococcus aureus reached 73.34% and 99.78%, respectively. In the strawberry preservation experiment, the composite film effectively inhibited the weight loss of the fruits, with a loss rate as low as 15.27% after 11 days, delayed the sensory deterioration of strawberries, and extended the shelf life by 4 days. Conclusion The water content, water solubility, swelling degree, ultraviolet light transmittance and antibacterial activity of the CS/GEL composite film with appropriate addition of TP are improved, exhibiting excellent ultraviolet barrier and antibacterial properties, effectively prolonging the preservation period of strawberries, and showing certain application potential in the field of fruit preservation. |
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