Arrieta Marina Patricia, Castro-López María del Mar, Rayón Emilio, Barral-Losada Luis Fernando, López-Vilariño José Manuel, López Juan, González-Rodríguez María Victoria
Instituto de Tecnologı́a de Materiales, Universitat Politècnica de Valencia , E-03801 Alcoy-Alicante, Spain.
J Agric Food Chem. 2014 Oct 15;62(41):10170-80. doi: 10.1021/jf5029812. Epub 2014 Oct 3.
Active biobased packaging materials based on poly(lactic acid)-poly(hydroxybutyrate) (PLA-PHB) blends were prepared by melt blending and fully characterized. Catechin incorporation, as antioxidant compound, enhanced the thermal stability, whereas its release was improved by the addition of acetyl(tributyl citrate) (ATBC) as plasticizer. Whereas the incorporation of ATBC resulted in a reduction of elastic modulus and hardness, catechin addition produced more rigid materials due to hydrogen-bonding interactions between catechin hydroxyl groups and carbonyl groups of PLA and PHB. The quantification of catechin released into a fatty food simulant and the antioxidant effectiveness after the release process were demonstrated. The effect of the materials' exposure to a food simulant was also investigated. PHB-added materials maintained their structural and mechanical properties after 10 days in a test medium that represents the worst foreseeable conditions of the intended use. Thus, plasticized PLA-PHB blends with catechin show their potential as biobased active packaging for fatty food.
基于聚乳酸-聚羟基丁酸酯（PLA-PHB）共混物的活性生物基包装材料通过熔融共混制备并进行了全面表征。作为抗氧化剂化合物的儿茶素的加入提高了热稳定性，而通过添加乙酰柠檬酸三丁酯（ATBC）作为增塑剂改善了其释放。虽然ATBC的加入导致弹性模量和硬度降低，但儿茶素的添加由于儿茶素羟基与PLA和PHB的羰基之间的氢键相互作用而产生了更刚性的材料。证明了释放到脂肪食品模拟物中的儿茶素的定量以及释放过程后的抗氧化效果。还研究了材料暴露于食品模拟物的影响。添加PHB的材料在代表预期使用中最恶劣可预见条件的测试介质中放置10天后仍保持其结构和机械性能。因此，含有儿茶素的增塑PLA-PHB共混物显示出作为脂肪食品生物基活性包装的潜力。
