In order to valorise winemaking grape stalks, subcritical water extraction at 160 and 180 °C has been carried out to obtain phenolic-rich extracts useful for developing active food packaging materials. Red (R) and white (W) varieties (from Requena, Spain) were used, and thus, four kinds of extracts were obtained. These were characterised as to their composition, thermal stability and antioxidant and antibacterial activity. The extracts were incorporated at 6 wt% into polylactic acid (PLA) films and their effect on the optical and barrier properties of the films and their protective effect against sunflower oil oxidation was analysed. Carbohydrates were the major compounds (25–38%) in the extracts that contained 3.5–6.6% of phenolic compounds, the R extracts being the richest, with higher radical scavenging capacity. Every extract exhibited antibacterial effect against and , while PLA films with extracts preserved sunflower oil against oxidation.

中文翻译：

---

用亚临界水从葡萄秆中提取的抗氧化剂和抗菌提取物。在活性食品包装开发中的潜在用途


为了提高酿酒葡萄秆的价值，在 160 和 180 °C 下进行亚临界水提取，以获得富含酚类的提取物，可用于开发活性食品包装材料。使用红色（R）和白色（W）品种（来自西班牙雷克纳），从而获得四种提取物。对它们的组成、热稳定性以及抗氧化和抗菌活性进行了表征。将提取物以 6 wt% 的量掺入聚乳酸 (PLA) 薄膜中，分析它们对薄膜光学和阻隔性能的影响以及对葵花籽油氧化的保护作用。提取物中以碳水化合物为主（25%～38%），酚类化合物含量为3.5%～6.6%，其中R提取物含量最丰富，具有较高的自由基清除能力。每种提取物都对 和 表现出抗菌作用，而含有提取物的 PLA 薄膜可以保护葵花籽油免受氧化。