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JAC Advance Access originally published online on May 30, 2006
Journal of Antimicrobial Chemotherapy 2006 58(2):449-451; 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

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

Chelsea J. Papadopoulos1,*, Christine F. Carson1, Katherine A. Hammer1 and Thomas V. Riley1,2

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 Division of Microbiology and Infectious Diseases, PathWest Laboratory Medicine WA Nedlands, Western Australia 6009, Australia

Received 1 November 2005; returned 18 February 2006; revised 16 April 2006; accepted 26 April 2006

*Corresponding author. Tel: +61-8-9346-4730; Fax: +61-8-9346-2912; E-mail: chelsea{at}cyllene.uwa.edu.au

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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