100B-16 |
Measurement of oxygen barrier and antimicrobial properties of biopolymer over-coated PE films contained preservative |
Y. S. PARK1, D. M. Ha2, G. H. Shin3, and H. J. Park3. (1) Department of Food technology, Korea Health Industry Development Institute, 57-1, Nolyangjin-dong, Dongjac-gu, Seoul, 156-800, South Korea, (2) Department of Food technology, Dongguk University, Seoul, 156-800, South Korea, (3) Graduate school of biotechnology, Korea University, 1-5ka, Anam-dong, Sungbuk-ku, Seoul, 136-701, South Korea Direct incorporation of preservative into the film is an economical method for manufacturing antimicrobial packaging. However, commercial synthetic films can not release continuously the preservative from the film. Then, biopolymers (chitosan, ¥ê-carrageenan, methylcellulose, hydroxymethylcellulose) which are incorporated with antimicrobial agent (potassium sorbate, sodium benzoate)are coated on the LDPE. This film can be used effectively as a potential °°antimicrobial packaging°± material and has a good oxygen barrier property. The objectives were a) to make effective antimcrobial packaging films b) to measure the oxygen barrier properties of these films c) to measure the antimicrobial property The antimicrobial films were prepared by spreading film forming solution on a thin-layer chromatography (TLC) plates(20¢¥20cm) that was covered with LDPE film. The agar well diffusion method was used to detect the antimcrobial property against Penicillium notatum, Rhizopus stolonifer, Saccaromyces cerevisae. The oxygen barrier of the films was measured by Mocon. Also FT-IR was used to analyze functional group of LDPE / biopolymer bilayer film. The antimicrobial films containing 1% preservatives yielded clear zone at the film/ medium interface as well as the area around the disc. Chitosan film and ¥ê-carrageenan film had higher O2 barrier properties than MC/HPMC film. The FT-IR spectra of bilayer films showed good adhesion between LDPE and biopolymers. In this study, the bilayer films showed a good antimicrobial and O2 barrier properties for application of antimicrobial packaging in active packaging.
Session 100B, Food Packaging
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