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J Hosp Infect. 2012 Jan;80(1):61-6. doi: 10.1016/j.jhin.2011.04.008. Epub 2011 Dec 6.

Reduction of surface contamination and biofilms of Enterococcus sp. and Staphylococcus aureus using a citrus-based vapour.

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De Montfort University, School of Pharmacy, Faculty of Health and Life Science, Leicester, UK.



Antibiotic-resistant organisms such as meticillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus sp. (VRE) are an ongoing problem in hospitals. Essential oil vapours (EOs) have been shown to reduce environmental bacterial contamination.


To assess the efficacy of Citri-V™, a vaporized blend of citrus EOs (orange: bergamot, 1:1 v/v) (Belmay, Northampton, UK), at removing Enterococcus sp. and S. aureus from stainless steel surfaces; and to investigate its effect on the formation of bacterial biofilms.


A microplate assay was used to assess the effect of the citrus vapour on the formation of biofilms and their metabolic activity. Biofilm removal from stainless steel surfaces was measured by a colorimetric assay and by digital microscopy.


The citrus vapour reduced VRE and MRSA on stainless steel surfaces by 1.5-3log(10) after 24h exposure. Staphylococcal biofilms were reduced both during and after formation, whereas enterococcal biofilms were significantly reduced (P≤0.05) only after formation. Metabolic activity decreased by up to 72% in strains tested. Two-dimensional digital microscopy showed reductions in biofilm coverage of the stainless steel disc by as much as 99.5%.


Citrus vapour has potential for application in the clinical environment, for instance as a secondary disinfectant to reduce surface contamination by VRE and MRSA.

[Indexed for MEDLINE]

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