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JAC Advance Access published online on May 30, 2006
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkl200
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© The Author 2006. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received November 1, 2005
Revised April 16, 2006
Accepted April 26, 2006

Brief report

Susceptibility of pseudomonads to Melaleuca alternifolia (tea tree) oil and components

Chelsea J. Papadopoulos 1 *, Christine F. Carson 1, Katherine A. Hammer 1, and Thomas V. Riley 2

1 Microbiology and Immunology Discipline, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
2 Microbiology and Immunology Discipline, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia; Division of Microbiology and Infectious Diseases, PathWest Laboratory Medicine WA, Nedlands, Western Australia 6009, Australia

* To whom correspondence should be addressed.
Chelsea J. Papadopoulos, E-mail: chelsea{at}cyllene.uwa.edu.au


  Abstract

Objectives: Thirty isolates of Pseudomonas aeruginosa, 15 isolates of Pseudomonas putida and 11 isolates of Pseudomonas fluorescens were tested for susceptibility to tea tree oil (TTO), the essential oil of Melaleuca alternifolia, and the components terpinen-4-ol, {alpha}-terpineol, cineole, {gamma}-terpinene and {rho}-cymene.

Methods: MICs were determined by broth microdilution in Mueller-Hinton medium supplemented with 0.002% (v/v) Tween 80.

Results: The MIC90 of TTO for all isolates tested was 4% (v/v) or less. Susceptibility to components tested varied between species.

Conclusions: Pseudomonas spp. are susceptible to TTO and some of its components although they are less susceptible than many other bacteria tested previously.

Keywords: terpenes; terpinen-4-ol; Pseudomonas aeruginosa; essential oils; antimicrobials.
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