Active packaging that releases antibacterial volatile oils has been one of the most promising approaches to protecting fresh food and increasing its shelf life. Existing strategies, however, are limited by the need to adjust packaging material to suit the particular antimicrobial and environmental conditions. Here we describe a new patch made of absorbent polymers and two volatile antimicrobial compounds, carvacrol and tea tree oil (TTO). After assessing several different polymers, microcrystalline cellulose was chosen as the absorbent matrix due to its high level of absorption, around 90% of its weight. Carvacrol and TTO were released into the head compartment in a controlled manner, reaching a plateau within 20 min. Both carvacrol and TTO patches exhibited marked antimicrobial activity against Escherichia coli, Listeria monocytogenes, Alternaria alternate, Penicillium commune and moderate activity against Pseudomonas putida. Visual and mechanical evaluation of strawberries and pumpkin specimens showed that carvacrol patches had the best effect on increasing shelf life compared to TTO and empty patches. The versatility of the patch, the simplicity of its production and its effectiveness demonstrated here make it very attractive as a new platform to extend the shelf life of fresh foods.
|Number of pages||7|
|Journal||Food Packaging and Shelf Life|
|State||Published - Dec 2018|
Bibliographical noteFunding Information:
This study was supported by the Israel Ministry of Health: The Research Projects and Fellowships Fund on Food and Nutrition with Impact on Public Health ( 3-0000-12832 ). We also acknowledge the core services and support provided by the Russell Berrie Nanotechnology Institute and the Lorry I. Lokey Center for Life Science and Engineering. We thank Dr. Nadav Nitzan and Prof. Ester Segal for generously providing the Alternaria alternate and for their help in the antifungal assay.
© 2018 Elsevier Ltd
- Active packaging
- Essential oils
- Food preservation
- Volatile antimicrobials