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Release of Naturally Derived Antimicrobial Agents from LDPE Films

By Marlene Jane Cran, L. A. S Rupika, Kees Sonneveld, Joseph Miltz and Stephen W Bigger

Abstract

The migration of the naturally derived antimicrobial (AM) agents, linalool, carvacrol, and thymol, from\ud low-density polyethylene (LDPE) films containing ethylene vinyl acetate (EVA) copolymer into the food simulants,\ud isooctane and various ethanol/water mixtures, was studied with a view towards examining the applicability of a\ud first-order kinetic approach as well as a diffusion model approach for describing these systems. The results suggest\ud that the proposed models adequately describe the release of AM agents. The combination of kinetic and diffusion\ud analyses can provide additional information about the release process using the same data set. The analyses suggest\ud that the release of linalool from LDPE/EVA depends on the EVA content in the formulation and that an optimum\ud level of EVA is required to minimize the rate of release. A modification of the existing “idealized diffusion” model\ud is proposed that enables the model to be applied to systems that demonstrate a departure fromlinearity when subjected\ud to conventional analysis. The applicability of the idealized diffusion modelwas compared with the “simulantlimited”\ud model and the results suggest that the formermodel is appropriate for describing most real systems when\ud the simulant (or foodstuff) is favored in the partitioning of the AM agent between the film and the simulant

Topics: 0908 Food Sciences, 0912 Materials Engineering, 970103 Expanding Knowledge in the Chemical Sciences, School of Engineering and Science, ResPubID19622, antimicrobial film, diffusion, ethylene vinyl acetate (EVA), low-density polyethylene (LDPE), \ud migration, naturally derived antimicrobial agents
Publisher: Wiley-Blackwell
Year: 2010
DOI identifier: 10.1111/j.1750-3841.2009.01506.x
OAI identifier: oai:eprints.vu.edu.au:8558
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