Journal Article

Susceptibility of <i>Candida albicans</i> biofilms grown in a constant depth film fermentor to chlorhexidine, fluconazole and miconazole: a longitudinal study

Hanadi Lamfon, Stephen R. Porter, Michael McCullough and Jonathan Pratten

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 53, issue 2, pages 383-385
Published in print February 2004 | ISSN: 0305-7453
Published online February 2004 | e-ISSN: 1460-2091 | DOI: http://dx.doi.org/10.1093/jac/dkh071
Susceptibility of Candida albicans biofilms grown in a constant  depth film fermentor to chlorhexidine, fluconazole and miconazole:  a longitudinal study

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Objectives: The aim of this study was to assess the resistance of Candida albicans biofilms to both antifungal and antimicrobial agents in vitro.

Methods: Biofilms of C. albicans were grown on denture acrylic discs in a constant depth film fermentor and maintained with artificial saliva. The MIC of fluconazole, miconazole and chlorhexidine for C. albicans was first determined. Using these data, 72 h biofilms were exposed to these agents at different MIC levels. In order to assess growth, biofilms were removed from the fermentor, incubated in the test agent for various periods, the biofilms disrupted and the viable yeast cells present determined. The MIC for these cells was then also determined. In a separate experiment, biofilms of various ages (2–72 h) were exposed to sub-biofilm MIC concentrations for two different periods.

Results: C. albicans biofilms were found to be highly resistant to fluconazole and miconazole compared with the same cells grown in suspension (≥1024 × MIC). In contrast, chlorhexidine inhibited the growth of C. albicans biofilms at a concentration up to 8 × MIC. When the susceptibility of biofilms over time was investigated, higher reductions were observed for chlorhexidine and miconazole than fluconazole for biofilms of 2 and 6 h.

Conclusions: We have shown in this study that the susceptibility of C. albicans to antifungal and antimicrobial agents changes throughout biofilm development.

Keywords: Keywords: in vitro, antifungal, antimicrobial, MIC

Journal Article.  1746 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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