Antibacterial properties of LDPE nanocomposite films in packaging of UF cheese. (January 2016)

• Record Type: Journal Article
• Authors: Beigmohammadi, Faranak; Peighambardoust, Seyed Hadi; Hesari, Javad; Azadmard-Damirchi, Sodeif; Peighambardoust, Seyed Jamaleddin; Khosrowshahi, Nader Karimian
• Is Part Of: Lebensmittel-Wissenschaft + Technologie =. Volume 65(2016)
• Page Start: 106
• Page End: 111
• Publication Date: 2016-01
• Subjects: Active packaging -- Antibacterial -- LDPE film -- Nanoparticle -- UF cheese; Food industry and trade -- Periodicals; Food -- Composition -- Periodicals; Microbiology -- Periodicals; Nutrition -- Periodicals; 664.005
• DOI: 10.1016/j.lwt.2015.07.059
• Languages: English
• ISSNs: 0023-6438

Abstract

Abstract: The purpose of this study was to investigate antibacterial potential of low-density polyethylene (LDPE) packaging films incorporating silver (Ag), copper oxide (CuO) and zinc oxide (ZnO) nanoparticles in measuring of coliform amounts of ultra-filtrated (UF) cheese. The initial LDPE/nanoparticle composites were produced by melting extrusion followed by extruding the obtained composites through a die to achieve a film thickness of 45 ± 5 μm. The number of surviving coliform bacteria was decreased by 4.21 log cfu/g after 4 weeks of storage at 4 ± 0.5 °C, whilst pure LDPE films showed a reduction of only 1.04 log cfu/g. A composition of 0% Ag, 1% CuO, 0% ZnO gave an optimum point in combined design using Design Expert analysis. A suitable microbial model was suggested for retarding coliform bacteria growth in UF cheese. The difference between the optimum point of nanocomposite film and its repeat was not significant (p < 0.05) by one-way ANOVA analysis using SPSS software, while the difference was significant for pure film. Migration of metallic nanoparticles into a food stimulant was within the accepted safe level. Highlights: A microbial model was suggested for antibactierial effect of active LDPE films in UF cheese. All films had antibacterial effects on colimforms after 4 weeks. LDPE film with Cu-Zno and with no Ag nanoparticles provided optimum antibacterial effect. Suggested statistical model verified optimum points obtained in microbial tests.