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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Development of an Iron Chelating Polyethylene Film for Active Packaging Applications
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Development of an Iron Chelating Polyethylene Film for Active Packaging Applications

机译：活性包装用铁螯合聚乙烯薄膜的开发

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摘要

Metal-promoted oxidation reactions are a major cause of food quality deterioration. Active packaging offers novel approaches to controlling such oxidation for the purpose of extending shelf life. Herein, we report modification of the surface of polyethylene (PE) films to possess metal chelating activity. Metal chelating carboxylic acids were introduced to the film surface using cross-Unking agents [polyethylenimine (PEI) or ethylenediamine (ED)] to increase the number of available carboxylic acids. ATR-FTIR, contact angle, dye assay, and iron chelating assay were used to characterize changes in surface chemistry after each functionalization step. The chelator poly(acrylic acid) (PAA) was attached to the surface at a density of 9.12 ± 0.71 nmol carboxyl groups/cm~2, and exliibited an iron chelating activity. The results indicate that PAA-modified PE films might have a higher affinity to Fe~(3+) than Fe~(2+) with the optimum binding pH at 5.0. Such inexpensive active packaging materials are promising in food industry for the preservation of liquid and semihquid food products and have application in heavy metal chelation therapy for biomedical materials as well.
机译：金属促进的氧化反应是导致食品质量下降的主要原因。主动包装提供了新颖的方法来控制这种氧化，以延长保质期。在本文中，我们报道了对聚乙烯（PE）薄膜表面的改性，使其具有金属螯合活性。使用交联剂[聚乙烯亚胺（PEI）或乙二胺（ED）]将金属螯合羧酸引入薄膜表面，以增加可用羧酸的数量。在每个功能化步骤之后，使用ATR-FTIR，接触角，染料分析和铁螯合分析来表征表面化学的变化。螯合剂聚丙烯酸（PAA）以9.12±0.71nmol羧基/ cm〜2的密度附着于表面，并具有铁螯合活性。结果表明，在5.0的最佳结合pH下，PAA改性的PE膜对Fe〜（3+）的亲和力可能高于Fe〜（2+）。这种廉价的活性包装材料在食品工业中有望用于保存液体和半水食品，并且还用于生物医学材料的重金属螯合疗法。

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