University of Perugia, Civil and Environmental Engineering Department, Strada di Pentima 4, 05100 Terni, Italy.
University of Perugia, Physic and Geology Department, Via Pascoli, 06123 Perugia, Italy.
Carbohydr Polym. 2018 Aug 1;193:239-248. doi: 10.1016/j.carbpol.2018.03.079. Epub 2018 Mar 26.
Novel ternary films have been realized by using poly(vinyl alcohol) (PVA) as polymeric matrix, nanostructured starch as reinforcement phase and hydroxytyrosol (HTyr), a low-molecular phenolic compound present in olive oil, as antioxidant agent. Nanostructured starch, in the form of starch nanocrystals (NC) and nanoparticles (NP) obtained by acid hydrolysis and ultrasound irradiation of starch derived from the bread wheat variety Cadenza (WT, amylose content 33%) and a derived-high amylose line (HA, amylose content 75%), was considered. The developed multifunctional films were characterized in terms of morphological, thermal and optical properties, water absorption capacity, overall and specific migration into a food simulant and antioxidant properties. Experimental data showed a prolonged release of HTyr from all ternary films and the released HTyr retained a strong antioxidant activity. The data, compared to those of PVA/HTyr binary films, demonstrated the key role of nanostructured starch in the ternary formulations in promoting a gradual release of HTyr. Overall, PVA fillm combined with nanoparticles from low amylose starch and hydroxytyrosol resulted as the most promising ternary formulation for food packaging applications.
新型三元膜是通过使用聚乙烯醇（PVA）作为聚合物基质，纳米结构淀粉作为增强相以及存在于橄榄油中的低分子酚类化合物羟基酪醇（HTyr）作为抗氧化剂来实现的。纳米结构淀粉，以通过酸水解和超声处理从面包小麦品种 Cadanza（WT，直链淀粉含量 33%）和衍生的高直链淀粉系（HA，直链淀粉含量 75%）获得的淀粉纳米晶（NC）和纳米颗粒（NP）的形式被考虑。所开发的多功能膜在形态，热和光学性能，吸水率，对食品模拟物的总迁移和特定迁移以及抗氧化性能方面进行了表征。实验数据表明，所有三元膜均能延长 HTyr 的释放时间，并且释放出的 HTyr 保持了很强的抗氧化活性。与 PVA/HTyr 二元膜的数据相比，实验数据表明纳米结构淀粉在三元配方中在促进 HTyr 逐渐释放方面起着关键作用。总体而言，PVA 薄膜与低直链淀粉纳米颗粒和羟基酪醇结合，是最有前途的用于食品包装应用的三元配方。
