Multiphase thermoplastic hybrid for controlled release of antimicrobial essential oils in active packaging film

Itan Moshe, Orli Weizman, Michal Natan, Gila Jacobi, Ehud Banin, Ana Dotan, Amos Ophir

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Active packaging, a new technology concept in the field of food packaging, has been introduced in recent years in order to provide quality and safety, as well as extend the shelf life of food products. Antimicrobial (AM) agents can be incorporated directly into the active packaging and migrate in a controlled manner to the headspace between the food and the package, inhibiting bacteria growth on the food surface. Naturally derived AM agent, such as essential oils (EOs), has received considerable attention for food preservation purposes, because of their effective AM activity against various bacteria and fungi. In the present study, AM active film systems based on polypropylene/polyamide blends, montmorillonite nanoclays, and thymol EO were produced to investigate the feasibility of controlling the release rate of thymol from food packaging systems. Selective localization of thymol in a specific phase in the system that derives from thermodynamic affinity was assumed to be useful in controlling its migration rate from the film to the headspace. EO retention in the film under two different time conditions was measured by spectroscopic analysis. The release rate of EO was determined using Gas chromatography technique and analyzed by diffusion model approach. Inhibition of bacterial growth was periodically tested for Listeria and Escherichia coli bacteria. This study confirms the thermodynamic affinity of polyamide phase with thymol that has a positive effect in retaining the EO. Results show controlled AM behavior of the active packaging films, based on various blend compositions.

Original languageEnglish
Pages (from-to)1476-1483
Number of pages8
JournalPolymers for Advanced Technologies
Issue number11
StatePublished - 1 Nov 2016

Bibliographical note

Publisher Copyright:
Copyright © 2016 John Wiley & Sons, Ltd.


  • active packaging
  • controlled release
  • headspace
  • multiphase system
  • thymol


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