Journal
JOURNAL OF FOOD SCIENCE
Volume 74, Issue 2, Pages M67-M72Publisher
WILEY
DOI: 10.1111/j.1750-3841.2009.01056.x
Keywords
citrus oil fractions; Listeria innocua; Listeria monocytogenes; natural antimicrobials; organic acids
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Funding
- USDA-NRI [2007-35201-18380]
- MARS, Inc
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The objectives of this study were to screen activity of citrus essential oil fractions (EOs) alone and in combination with organic acids against 2 species of Listeria. Five citrus EOs were initially screened by disc diffusion assay for antibacterial activity. Cold pressed terpeneless Valencia orange oil (CP terpeneless oil) had the strongest bacteriostatic ( MIC) and bactericidal (MBC) properties at 0.55% and 1.67%, respectively. Four organic acids were tested for effectiveness against Listeria. Citric and malic acids proved to be the most effective with MBC of 1.1% alone. Assays were conducted to determine synergistic effects of EOs and citric or malic acids. There was a significant decrease in MIC and MBC to 0.04% EO plus 0.12% malic or citric acid. EOs from citrus paired with organic acids offer the potential as an all-natural antimicrobial for improving the safety of all-natural foods.
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