Abstract In the present study, gelatin-sodium alginate (GSA) based films were integrated with Pseuderanthemum palatiferum (Nees) Radlk. freeze-dried powder (PFP) obtained by subcritical water extraction. The influences of PFP at different concentrations on physical properties and antioxidant activity of GSA based films were investigated. Total phenolic content, antioxidant activity increased with the increase in PFP concentrations. Moisture content (MC) of films was not significantly different, water vapor permeability (WVP) decreased, while water solubility (WS) increased with the growth of PFP concentrations. Regarding mechanical properties, tensile strength (Ts) of GSA based films was improved; however, elongation at break (EAB) decreased when the content of PFP in film-forming solutions increased. GSA based films exhibited good microstructure, thermal resistance, and interaction between gelatin and phenolic compounds. From the obtained results, composite GSA based films blended with PFP can be potentially applied in the food packing to extend food shelf life.

中文翻译：

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含有 Pseuderanthemum palatiferum (Nees) Radlk 的基于明胶 - 海藻酸钠的薄膜。亚临界水萃取得到的冻干粉

摘要 在本研究中，明胶-海藻酸钠 (GSA) 基薄膜与 Pseuderanthemum palatiferum (Nees) Radlk 相结合。通过亚临界水提取获得的冻干粉 (PFP​​)。研究了不同浓度的 PFP 对基于 GSA 的薄膜的物理性能和抗氧化活性的影响。总酚含量、抗氧化活性随着PFP浓度的增加而增加。薄膜的含水量（MC）没有显着差异，水蒸气渗透率（WVP）降低，而水溶性（WS）随着PFP浓度的增加而增加。在机械性能方面，GSA 基薄膜的拉伸强度 (Ts) 有所提高；然而，当成膜溶液中 PFP 的含量增加时，断裂伸长率 (EAB) 会降低。基于 GSA 的薄膜表现出良好的微观结构，耐热性以及明胶和酚类化合物之间的相互作用。从获得的结果来看，与 PFP 混合的基于 GSA 的复合薄膜可潜在地应用于食品包装以延长食品保质期。