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Antimicrobial activity of plant essential oils using food model media: efficacy, synergistic potential and interactions with food components.

Gutierrez, J, Barry-Ryan, C and Bourke, P (2009) Antimicrobial activity of plant essential oils using food model media: efficacy, synergistic potential and interactions with food components. Food Microbiol, 26 (2). pp. 142-150.

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Abstract

The aim of this study was to optimise the antimicrobial efficacy of plant essential oils (EOs) for control of Listeria spp. and spoilage bacteria using food model media based on lettuce, meat and milk. The EOs evaluated were lemon balm, marjoram, oregano and thyme and their minimum inhibitory concentrations (MIC) were determined against Enterobacter spp., Listeria spp., Lactobacillus spp., and Pseudomonas spp. using the agar dilution method and/or the absorbance based microplate assay. MICs were significantly lower in lettuce and beef media than in TSB. Listeria strains were more sensitive than spoilage bacteria, and oregano and thyme were the most active EOs. EO combinations were investigated using the checkerboard method and Oregano combined with thyme had additive effects against spoilage organisms. Combining lemon balm with thyme yielded additive activity against Listeria strains. The effect of simple sugars and pH on antimicrobial efficacy of oregano and thyme was assessed in a beef extract and tomato serum model media. EOs retained greater efficacy at pH 5 and 2.32% sugar, but sugar concentrations above 5% did not negatively impact EO efficacy. In addition to proven antimicrobial efficacy, careful selection and investigation of EOs appropriate to the sensory profile of foods and composition of the food system is required. This work shows that EOs might be more effective against food-borne pathogens and spoilage bacteria when applied to foods containing a high protein level at acidic pH, as well as moderate levels of simple sugars.

Item Type: Article
Authors :
NameEmailORCID
Gutierrez, Jj.gutierrez@surrey.ac.ukUNSPECIFIED
Barry-Ryan, CUNSPECIFIEDUNSPECIFIED
Bourke, PUNSPECIFIEDUNSPECIFIED
Date : April 2009
Identification Number : 10.1016/j.fm.2008.10.008
Uncontrolled Keywords : Animals, Carbohydrates, Colony Count, Microbial, Consumer Product Safety, Dose-Response Relationship, Drug, Drug Synergism, Enterobacter, Food Contamination, Food Microbiology, Food Preservation, Humans, Hydrogen-Ion Concentration, Lactobacillus, Lettuce, Listeria, Meat, Microbial Sensitivity Tests, Milk, Origanum, Plant Oils, Pseudomonas, Species Specificity, Thymus Plant
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 10:00
Last Modified : 17 May 2017 14:46
URI: http://epubs.surrey.ac.uk/id/eprint/826006

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