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Development and characterization of moisture- and heat-activated oxygen scavenging nanoparticle.

机译：湿气和热活化除氧纳米颗粒的开发和表征。

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摘要

alpha-tocopherol and a transition metal, iron, mixture was evaluated as a possible oxygen scavenger. The effects of moisture, amount of transition metal, and thermal processing on oxygen scavenging capability were also investigated. Results showed that alpha-tocopherol and transition metal had 6.72 cc O 2 per gram of oxygen scavenging capacity and 0.11 cc O2 per gram per day of oxygen scavenging rate.;Nanoencapsulation technology was adopted for the possible oxygen scavenging activation system. alpha-tocopherol-loaded poly epsilon-caprolactone (PCL) nanoparticles were prepared by oil in water (O/W) emulsion solvent evaporation with ultrasonification. The effects of PCL concentration, solvent in oil phase, and ultrasonification time on encapsulation efficiency (%), particle mean size, and loading (%) were investigated. Overall, 5% PCL in methylene chloride (DCM) as the solvent in the oil phase coupled with 3 minute ultrasonification time showed the best encapsulation formulation. Therefore, this formulation was selected for further research.;alpha-tocopherol-loaded nanoparticles and a transition metal in scavenger mixture were evaluated as a heat activated oxygen scavenger. The effects of moisture, amount of transition metal, and thermal processing on oxygen scavenging capability were also studied. Results showed that alpha-tocopherol-loaded nanoparticle and transition metal had 6.44 cc O2 per gram of oxygen scavenging capacity and 0.21 cc O2 per gram per day of oxygen scavenging rate. Heat was used as the activator to initiate the oxygen scavenging reaction. However, adding moisture lowered the oxygen scavenging capability.;An active fish gelatin film was developed by customized film applicator and its physical properties and oxygen scavenging capabilities were investigated. The effects of moisture and thermal processing on oxygen scavenging capability were also studied. alpha-tocopherol-loaded nanoparticles and a transition metal was added into the warm water fish gelatin and cast into a film. Agglomeration of the oxygen scavenger caused a rough film surface, decreased tensile strength, increased elongation at break, and increased oxygen permeability. The active fish gelatin film had an oxygen scavenging capacity of 1969.08 cc O2 per square meter per mil thickness with water as the activator which triggered the oxygen scavenging reaction. However, thermal processing at temperature above 140oF destroyed the oxygen scavenging ability of the film.
机译：将α-生育酚和过渡金属铁的混合物评估为可能的除氧剂。还研究了水分，过渡金属含量和热处理对除氧能力的影响。结果表明，α-生育酚和过渡金属的克氧清除能力为每克6.72 cc O 2和每天每克氧清除率为0.11 cc O2。;可能的除氧活化系统采用纳米囊封技术。通过超声水包油（O / W）乳化溶剂蒸发法制备了负载有α-生育酚的聚ε-己内酯（PCL）纳米颗粒。研究了PCL浓度，油相溶剂和超声处理时间对包封效率（％），颗粒平均粒径和载量（％）的影响。总体而言，在油相中作为溶剂的二氯甲烷（DCM）中的5％PCL和3分钟的超声处理时间显示出最佳的封装配方。因此，选择该配方进行进一步研究。评价了α-生育酚负载的纳米颗粒和清除剂混合物中的过渡金属作为热活化除氧剂。还研究了水分，过渡金属含量和热处理对除氧能力的影响。结果表明，负载有α-生育酚的纳米颗粒和过渡金属的克氧清除能力为每克6.44 cc O2和每天克氧清除率为0.21 cc O2。使用热作为活化剂来引发除氧反应。然而，增加水分会降低其除氧能力。；定制的薄膜涂布器研制了一种活性鱼明胶薄膜，并研究了其物理性质和除氧能力。还研究了水分和热处理对除氧能力的影响。将负载有α-生育酚的纳米颗粒和过渡金属添加到温水鱼明胶中并流延成薄膜。除氧剂的附聚导致膜表面粗糙，抗张强度降低，断裂伸长率增加和氧渗透性增加。活性鱼明胶薄膜具有每平方米每密耳厚度1969.08 cc O2的除氧能力，其中水作为活化剂触发了除氧反应。但是，在高于140oF的温度下进行热处理会破坏薄膜的除氧能力。

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  • 作者

    Byun, Young Jae.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering Agricultural.;Chemistry Agricultural.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 152 p.
  • 总页数 152
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业工程;农业化学;
  • 关键词

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