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http://dx.doi.org/10.20909/kopast.2019.25.3.69

UV Barrier and Antimicrobial Activity of Agar-based Composite Films Incorporated with ZnO Nanoparticles and Grapefruit Seeds Extract  

Kim, Yeon Ho (Department of Food and Nutrition, Kyung Hee University)
Bang, Yeong-Ju (Department of Food and Nutrition, Kyung Hee University)
Yoon, Ki Sun (Department of Food and Nutrition, Kyung Hee University)
Rhim, Jong-Whan (Department of Food and Nutrition, Kyung Hee University)
Publication Information
KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY / v.25, no.3, 2019 , pp. 69-77 More about this Journal
Abstract
Agar-based nanocomposite films were prepared by incorporation of zinc oxide nanoparticles (ZnONP) and grapefruit seed extract (GSE). The composite films were characterized using FT-IR, UV-visible spectroscopy and thermalgravimetric analysis (TGA). The composite films showed light absorption peaks at 220 and 380 nm, characteristic for GSE and ZnONP, respectively. The UV-light transmittance of the agar film was markedly reduced from 54.4 ± 1.3% to 5.8 ± 2.5% with little sacrifice of transparency when 3 wt% ZnONP and 5 wt% GSE were added. The mechanical and water vapor barrier properties increased slightly though they were not significant statistically by the addition of ZnONP and GSE. The nanocomposite films showed stronger antibacterial activity against L. monocytogenes than E. coli O157: H7 and the antibacterial activity was affected by bacterial types as well as concentrations of ZnONP and GSE. The nano-composite film incorporated with 3 wt% of ZnONP and 5 wt% of GSE exhibited strong antibacterial activity against Listeria monocytogenes and E. coli O157: H7. The results indicate that 3 wt% of ZnONP and 5 wt% of GSE are the optimal concentrations for producing functional agar/ZnONP/GSE composite films.
Keywords
Agar; Grapefruit seed extract; ZnO nanoparticle; Nanocomposite film; Antimicrobial; UV barrier;
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