Volume 45, Issue 3 p. 201-208
Original Article
Free Access

Effect of Sealing and Tween 80 on the Antifungal Susceptibility Testing of Essential Oils

Shigeharu Inouye

Corresponding Author

Shigeharu Inouye

Teikyo University Institute of Medical Mycology, Hachioji, Tokyo, 192-0395 Japan

Address correspondence to Dr. Shigeharu Inouye, Teikyo University Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo 192–0395, Japan. Fax: +81–426–74–9190.Search for more papers by this author
Tsutomu Tsuruoka

Tsutomu Tsuruoka

Meiji Seika Kaisha, Ltd., Chuo-ku, Tokyo, 104-8002 Japan

Search for more papers by this author
Katsuhisa Uchida

Katsuhisa Uchida

Teikyo University Institute of Medical Mycology, Hachioji, Tokyo, 192-0395 Japan

Search for more papers by this author
Hideyo Yamaguchi

Hideyo Yamaguchi

Teikyo University Institute of Medical Mycology, Hachioji, Tokyo, 192-0395 Japan

Search for more papers by this author
First published: 14 November 2013
Citations: 47

Abstract

Concentrations of essential oils showing high volatility decreased substantially in broth and agar media when incubated under open conditions. The decrease in the half life was from 0.7 to 38 hr in broth medium at 27 C. When evaporation was prevented by sealing, MIC values against Aspergillus fumigatus, Candida albicans and Trichophyton mentagrophytes by broth or agar dilution assay were lowered two to eight-fold, as compared with those obtained under open conditions. Addition of Tween 80 caused a rise of the MICs against A. fumigatus by two to four-fold in broth dilution assay, but little affected the MICs in agar dilution assay.

Abbreviations

  • CFU
  • colony forming unit
  • DMSO
  • dimethyl-sulfoxide
  • GC
  • gas chromatography
  • MFC
  • minimum fungicidal concentration
  • MIC
  • minimum inhibitory concentration
  • NCCLS
  • National Committee for Clinical Laboratory Standards.
    • The full text of this article hosted at iucr.org is unavailable due to technical difficulties.