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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Immobilization of Caffeic Acid on a Polypropylene Film: Synthesis and Antioxidant Properties
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Immobilization of Caffeic Acid on a Polypropylene Film: Synthesis and Antioxidant Properties

机译:咖啡酸固定在聚丙烯膜上的合成及抗氧化性能

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摘要

The immobilization of caffeic acid (CA) on a polypropylene (PP) film was successfully performed through the covalent binding of the caffeoyl chloride on a modified polymeric surface of PP films grafted with hydroxyethyl methacrylate as monomer (PP-g-HEMA). The different reaction steps were monitored by FT-IR spectroscopy. The synthesized films were characterized by Folin-Ciocalteu method by measuring the available phenolic groups as caffeic acid equivalents linked to the surface. The antioxidant efficiency of the modified polymers was evaluated by typical spectrophometric methods, such as the bleaching of radicals DPPH~· and ABTS~(·+), and the inhibition of the enzymatically induced coupled oxidation of linoleic acid and betacarotene. The available phenolic groups on the modified film presented a good correlation with the antiradical activity toward DPPH~·. Moreover, the polymer synthesized in this work showed a good protective activity against ascorbib acid oxidation in real samples of orange juice.
机译:通过将咖啡酰氯与接枝甲基丙烯酸羟乙酯作为单体(PP-g-HEMA)的PP膜的改性聚合物表面上的共价键合,成功地将咖啡酸(CA)固定在聚丙烯(PP)膜上。通过FT-IR光谱监测不同的反应步骤。通过Folin-Ciocalteu方法表征合成的膜,方法是测量作为连接至表面的咖啡酸当量的可用酚基。用典型的分光光度法评价了改性聚合物的抗氧化效率,如自由基DPPH〜·和ABTS〜(·+)的漂白,以及酶促亚油酸和β-胡萝卜素的偶联氧化的抑制作用。改性膜上可利用的酚基与DPPH〜·的自由基活性具有良好的相关性。此外,在这项工作中合成的聚合物在真实的橙汁样品中显示出良好的抗坏血酸氧化的保护活性。

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