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首页> 外文期刊>Journal of Polymers and the Environment >Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials
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Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

机译：木质素作为可生物降解包装材料中抗氧化剂的潜力

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Due to their polyphenolic structure lignins bear a number of interesting functional properties, such as antioxidant activity. Natural antioxidants are very much looked for in the aim of protection of light or oxygen sensitive goods and are being used in active packaging. Poly(lactide) (PLA)-lignin films were prepared by twin screw extrusion followed by thermo-compression using two different commercial sources of alkali lignins obtained from gramineous plants. A good dispersion of lignin in the matrix was observed. Mechanical properties of the compounded material were merely diminished and oxygen barrier properties slightly enhanced. The chromatographic study of the lignins revealed that the low molecular weight fraction of both lignins increased during the polymer processing. The migration of low molecular weight compounds in an ethanol/water solution simulating fatty foodstuff was performed and the antioxidant activity of the extract was analysed. It was found that the activity increases with increasing severity of the heat treatment because of the generation of free phenolic monomers during processing. These results open an interesting way for application of lignins as an active compound in packaging materials. Lignins do not impair the mechanical and barrier performance of the polymer and the plastics processing even allows for the generation of active substances.
机译：木质素由于具有多酚结构，因此具有许多有趣的功能特性，例如抗氧化活性。为了保护对光或氧气敏感的商品，人们非常希望使用天然抗氧化剂，并正在将其用于活性包装。聚（丙交酯）（PLA）-木质素薄膜是通过双螺杆挤出，然后使用从禾本科植物获得的两种不同商业来源的碱性木质素进行热压制备的。观察到木质素在基质中的良好分散。仅降低了复合材料的机械性能，并且略微提高了氧气阻隔性能。木质素的色谱研究表明，两种木质素的低分子量部分在聚合物加工过程中均增加。进行低分子量化合物在模拟脂肪食品的乙醇/水溶液中的迁移，并分析提取物的抗氧化活性。已经发现，由于热处理过程中游离酚类单体的产生，其活性随热处理强度的增加而增加。这些结果为木质素作为活性化合物在包装材料中的应用开辟了有趣的途径。木质素不会损害聚合物的机械性能和阻隔性能，并且塑料加工甚至会产生活性物质。

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