Abstract New antioxidant films based on ethylene vinyl alcohol (EVOH) copolymer containing betalain-rich red beet were successfully manufactured and characterized to develop bioactive packaging for food products. Two types of red beet (powder and extract) at different proportions (0.1, 0.5, 1.0, 1.5, 2.0 and 2.5 % (w/w)) were incorporated into EVOH films, with attention focused on the optical, chemical, thermal, structural, and mechanical and antioxidant properties. The incorporation of any red beet type into EVOH resulted in purple-colored and semi-crystalline thin films, without modifying their thermal stability and mechanical properties. The addition of the beet extract led to a film with higher color intensity, antioxidant activity and lower water loss rate, whereas the addition of powdered beet resulted in an improved UV barrier compared to the extract. The results showed that new antioxidant food packaging films based on EVOH could be realized by utilizing beetroot extract or powder obtained from natural resources.

中文翻译：

---

含有富含甜菜碱的甜菜根的抗氧化乙烯乙烯醇共聚物薄膜的光学、结构、机械和热特性

摘要 基于含有富含甜菜碱的红甜菜的乙烯乙烯醇 (EVOH) 共聚物的新型抗氧化膜被成功制造并表征，以开发用于食品的生物活性包装。将两种不同比例（0.1、0.5、1.0、1.5、2.0 和 2.5% (w/w)）的红甜菜（粉末和提取物）加入到 EVOH 薄膜中，重点关注光学、化学、热、结构，以及机械和抗氧化性能。将任何类型的红甜菜加入 EVOH 都会产生紫色和半结晶的薄膜，而不会改变它们的热稳定性和机械性能。甜菜提取物的添加使薄膜具有更高的颜色强度、抗氧化活性和更低的失水率，而与提取物相比，添加甜菜粉可改善紫外线屏障。结果表明，利用甜菜根提取物或从自然资源中提取的粉末，可以实现基于 EVOH 的新型抗氧化食品包装膜。