Authors: Scollard, Johann; Francis, Gillian A.; O'Beirne, David

Source: Journal of Food Protection®, Volume 72, Number 6, June 2009 , pp. 1209-1215(7)

Publisher: International Association for Food Protection

Abstract:

Natural antimicrobials such as plant essential oils (EOs) may be useful for controlling pathogenic bacteria on fresh-cut vegetables. The antilisterial properties of EOs (thyme, oregano, and rosemary), in combination with different storage atmospheres (air, 5% CO₂-2% O₂-93% N₂, and 20% CO₂-1% O₂-79% N₂) and temperatures (4 and 8°C), were examined using a gas flow-through system combined with a vegetable agar model. The antimicrobial effects of the EOs varied depending on the oil, the Listeria strain and species, the method of application, and the storage conditions tested. Using the disk diffusion assay, the antilisterial effectiveness of the oils was in the following order: thyme EO > oregano EO > rosemary EO. Volatiles released from the EOs resulted in very small antilisterial effects, indicating that the oils needed to be in direct contact with cultures in order to be effective. There were strain and species effects, with L. innocua NCTC 11288 exhibiting the strongest resistance to EOs, and L. monocytogenes NCTC 7973 being the most sensitive strain. In addition, the effectiveness of the EOs was influenced by storage atmosphere and temperature. Use of EOs in combination with a gas atmosphere of 20% CO₂-1% O₂-79% N₂ had the greatest antilisterial effect, suggesting that high CO₂ atmospheres enhanced the antilisterial properties of EOs. Lowering the storage temperature from 8 to 4°C improved the antilisterial activity of thyme oil. It is concluded that thyme and oregano EOs display strong inhibitory effects against Listeria and that increasing CO₂ levels and lowering storage temperatures further enhance these antilisterial effects.

Document Type: Research article

Affiliations: 1: Food Science Research Centre, Department of Life Sciences, University of Limerick, Limerick, Ireland

Publication date: 2009-06-01

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