聚乙烯醇/明胶/茶多酚复合膜的制备及草莓保鲜性能研究

Preparation and Strawberry Preservation Performance of Polyvinyl Alcohol/Gelatin/Tea Polyphenol Composite Films

中文关键词:  聚乙烯醇  明胶  茶多酚  可降解性  保鲜膜

英文关键词:Polyvinyl alcohol  Gelatin  Tea polyphenols  Degradability  Preservation film

中文摘要:

      目的 以聚乙烯醇(polyvinyl alcohol, PVA)、明胶(gelatin, GEL）、茶多酚（tea polyphenols, TP）为成膜基材，制备一种新型复合膜。方法 通过溶液共混流涎成膜法制备不同茶多酚含量的聚乙烯醇/明胶复合膜，测定膜的机械性能、溶胀率、水蒸气透过率、透光率、表面形貌的指标。同时，对制备的复合膜土埋降解和草莓保鲜性能进行了研究。结果 明胶、聚乙烯醇、茶多酚三者具有良好的相容性，复合膜表面致密平整；当茶多酚添加量为1%时力学性能最优，拉伸强度为9.02 Mpa、断裂伸长率为204.61%，紫外光屏蔽率(紫外线A、紫外线B)达到70.00%与93.04%，复合膜具有一定的耐水性与水蒸气阻隔性；土埋降解率12 d时达到10.74%，草莓保鲜实验中有效降低了质量损失率，改善草莓贮藏过程中的感官品质。结论 添加适当比例茶多酚的聚乙烯醇/明胶复合膜的综合性能良好，具有优异的紫外阻隔性与可降解性，能够有效延长草莓果实的贮存时间，该新型复合膜具有一定的应用前景。

英文摘要:

      Objective To develop a novel composite film, polyvinyl alcohol (PVA), gelatin (GEL), and tea polyphenols (TP) were utilized as film-forming materials. Methods PVA/gelatin composite films with varying TP content were prepared using a solution blending and casting method. The mechanical properties, swelling ratio, water vapor transmission rate, light transmittance, and surface morphology of the films were evaluated. Additionally, the soil burial degradation and strawberry preservation performance of the composite films were investigated. Results Strong compatibility among gelatin, PVA, and TP, with the composite film surface appearing dense and smooth. Optimal mechanical properties were observed at 1% TP content, yielding a tensile strength of 9.02 MPa and an elongation at break of 204.61%. The film exhibited UV shielding rates of 70.00% for UVA and 93.04% for UVB, along with moderate water resistance and water vapor barrier properties. The soil burial degradation rate reached 10.74% after 12 days. In strawberry preservation experiments, the film effectively reduced weight loss and improved sensory quality during storage. Conclusion The PVA/gelatin composite film with appropriate TP content demonstrates overall good performance, excellent UV barrier properties, and biodegradability. It effectively extends the storage time of strawberries, indicating potential applications for this novel composite film.