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Tocopherol stability in controlled release packaging films.

机译：控释包装薄膜中的生育酚稳定性。

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摘要

Increasing the shelf-life of packaged foods is of great interest to the food science community. Controlled release packaging (CRP) materials have been developed that are capable of releasing protective compounds (antioxidants, antimicrobials) into the food at rates suitable for long term protection. While the technical challenges of development have been met, FDA approval must be granted before these materials can be used commercially. One critical step in the FDA approval process for food contact materials is to ensure that no toxic products are formed during processing, and that sufficient levels of the added compound are retained to provide the stated functionality.;Tocopherol was chosen as an active compound for incorporation into CRP films as it is a natural, potent antioxidant with positive consumer recognition as Vitamin E. It has been used at low levels as a polymer stabilizer, with no problematic degradation reported. Tocopherol containing films were produced by cast film extrusion of LDPE, PP and a 50:50 blend of these polymers. Multiple extrusion conditions were chosen within standard processing parameters to apply varying degrees of thermal and mechanical stress on the polymer melt. Resulting films were analyzed for their physical properties, recoverable tocopherol, volatile and non-volatile degradation products, as well as antioxidant activity assays.;This study showed that tocopherol recovery is high (92-100%) for all polymer compositions and processing methods, but greatest loss was seen in PP films subjected to high shear. GC-MS analysis shows only polymer additives, with no volatile degradation products formed from tocopherol. A reduction in the level of polymer volatiles was also noted. Analysis by LC-MS has provided tentative identification of two tocopherol dimers and tocoquinone, all previously documented degradation products of tocopherol. Little variation was observed between different processing methods. Antioxidant assays demonstrate that extracts from the tocopherol containing films exhibit as much, or greater antioxidant activity as unprocessed mixed tocopherols.;While further work remains to confirm the identities of the products identified and provide accurate quantification, this research supports the safety and antioxidant effectiveness of tocopherol containing extruded polymer films.
机译：提高包装食品的保质期是食品科学界非常感兴趣的。已经开发出能够以适合长期保护的速率将保护性化合物（抗氧化剂，抗微生物剂）释放到食品中的控释包装材料。尽管开发的技术难题已得到解决，但在将这些材料用于商业用途之前必须获得FDA的批准。 FDA批准食品接触材料的关键步骤之一是确保加工过程中不形成有毒产品，并确保保留足够量的添加化合物以提供规定的功能。;选择生育酚作为活性化合物并入由于它是一种天然的，有效的抗氧化剂，在消费者中得到了肯定，被认为是维生素E。它已被少量用作聚合物稳定剂，没有降解问题的报道。含生育酚的薄膜是通过LDPE，PP和这些聚合物的50:50混合物的流延薄膜挤出生产的。在标准加工参数内选择多个挤出条件，以对聚合物熔体施加不同程度的热应力和机械应力。分析了所得薄膜的物理性质，可回收的生育酚，挥发性和非挥发性降解产物以及抗氧化活性的测定方法;该研究表明，对于所有聚合物组合物和加工方法，生育酚的回收率均很高（92-100％），但是在承受高剪切力的PP薄膜中损失最大。 GC-MS分析显示仅聚合物添加剂，没有生育酚形成的挥发性降解产物。还注意到聚合物挥发物含量的降低。 LC-MS分析提供了两种生育酚二聚体和生育酚醌的初步鉴定，这两个都是先前记录的生育酚降解产物。在不同的加工方法之间观察到很小的变化。抗氧化剂测定表明，含有生育酚的薄膜中的提取物具有与未加工的混合生育酚相同或更高的抗氧化活性。含有生育酚的挤出聚合物薄膜。

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  • 作者

    Lang, Jillian C.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Agriculture Food Science and Technology.;Engineering Packaging.
  • 学位 M.S.
  • 年度 2009
  • 页码 217 p.
  • 总页数 217
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农产品收获、加工及贮藏;包装工程;
  • 关键词

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