DEVELOPMENT OF METAL CHELATING MATERIALS FOR ANTIOXIDANT ACTIVE PACKAGING

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Abstract

Synthetic metal chelators (e.g. ethylenediaminetetraacetic acid, EDTA) are widely used as additives to control trace transition metal induced oxidation in consumer products. To enable removal of synthetic chelators in response to increasing consumer demand for clean label products, metal-chelating active food packaging technologies have been developed with demonstrated antioxidant efficacy in simulated food systems. However, fabrication of metal-chelating materials in the proof of concept research leveraged batch processes (e.g. degassing, and long reaction in solution) to immobilize metal-chelating ligands, and had limited industrial translatability for large-scale fabrication. In this dissertation work, various synthesis techniques were investigated to the scalability of the material preparation processes. A scalable laminated photografting technique successfully replaced batch degassing process originally required to prepare functional surfaces. Finally, a photocurable metal chelating copolymer coating was developed to enable potential simple coat/cure preparation of materials. Iminodiacetic acid (IDA) was investigated as a primary metal chelating ligand and was immobilized onto food packaging materials using the above techniques. The surface chemistry, chemical chelating performance and antioxidant performance against oxidative spoilage (lipid oxidation and ascorbic acid degradation as model systems) of the resulting IDA functionalized materials were demonstrated.

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2018-08-30
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Food science; Materials Science; active packaging; antioxidant; metal chelation; photocurable coating; polymer synthesis
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Union Local
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Goddard, Julie Melissa
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Ober, Christopher Kemper
Moraru, Carmen I.
Degree Discipline
Food Science and Technology
Degree Name
Ph. D., Food Science and Technology
Degree Level
Doctor of Philosophy
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Government Document
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dissertation or thesis
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