Manufacture of metal-based nanoparticles and their incorporation into plastic materials for the development of active antimicrobial food packaging

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dc.contributor.advisor Morris, Michael A. en
dc.contributor.advisor Kerry, Joseph P. en
dc.contributor.advisor Cruz Romero, Malco en Hasim, Azlin 2017-06-16T09:11:50Z 2016 2016
dc.identifier.citation Hasim, A. 2016. Manufacture of metal-based nanoparticles and their incorporation into plastic materials for the development of active antimicrobial food packaging. PhD Thesis, University College Cork. en
dc.identifier.endpage 295 en
dc.description.abstract Silver (Ag), copper (Cu) and zinc oxide (ZnO) nanoparticles (NPs) were synthesized and antimicrobially assessed. Ag NPs showed the best antimicrobial activity (AA) against a wide range of microorganisms: Staphylococcus aureus, Bacillus cereus, Escherichia coli and Pseudomonas fluorescens as well as microflora isolated from meat products. Ag NPs were then employed to manufacture antimicrobial films via solvent casting, extrusion or coating techniques. The resulting films were assessed in terms of their mechanical, thermal, barrier and antimicrobial properties. Surface modification of commercial polymer films using piranha solution or UV/ozone treatment was carried out to increase wettability and attachment of Ag. In general, the mechanical and thermal properties of the active films were dependent upon the type of polymer and method employed to incorporate Ag NPs. Regardless of the method used to manufacture Ag-active films, the shelf-life of CBF was significantly extended. UV/ozone treatment increased the wettability of commercial polymer films compared to piranha solution and AA of the Ag-coated LDPE films increased with increased exposure to UV/ozone. Novel methods to manufacture Ag-coated films were developed using self-assembled polystyrene-b-polyethylene (PS-b-PEO) block copolymer (BCP) and layer-by-layer process. Antimicrobial testing showed that Ag-active films had good AA against Gram-positive and Gram-negative bacteria. However, these methods were not easy to scale-up. Therefore, a simple spray coating process for producing Ag-coated films was developed using Pluronic™ surfactant and PS-b-PEO BCP. The AA of the Ag-active films were depended upon the initial concentration of Ag precursor used and the number of Ag coatings applied. Generally, Gram-negative bacteria were more susceptible to Ag NPs than Gram-positive bacteria and that pure culture bacteria were more susceptible than microflora isolated from meat products. The Ag-active films developed in this thesis have the potential to be used as antimicrobial packaging in food packaging applications. en
dc.description.sponsorship Department of Agriculture, Fisheries and Food, Ireland (Food Institutional Research Measure (FIRM) ) en
dc.format.mimetype application/pdf en
dc.language English en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2016, Azlin Hasim. en
dc.rights.uri en
dc.subject Silver nanoparticles en
dc.subject Antimicrobial activity en
dc.subject Shelf-life en
dc.subject Antimicrobial packaging en
dc.subject Surface modification en
dc.title Manufacture of metal-based nanoparticles and their incorporation into plastic materials for the development of active antimicrobial food packaging en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Food Science and Technology) en
dc.internal.availability Full text not available en Indefinite en 10000-01-01
dc.description.version Accepted Version
dc.contributor.funder Department of Agriculture, Fisheries and Food, Ireland en
dc.description.status Not peer reviewed en Food and Nutritional Sciences en
dc.check.reason This thesis contains information that was provided in confidence en
dc.check.opt-out Yes en
dc.thesis.opt-out true
dc.check.entireThesis Entire Thesis Restricted
dc.check.embargoformat Both hard copy thesis and e-thesis en
dc.internal.conferring Autumn 2015 en

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© 2016, Azlin Hasim. Except where otherwise noted, this item's license is described as © 2016, Azlin Hasim.
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