Atividade antifúngica de óleos essenciais frente à Candida albicans isoladas de pacientes HIV positivos / Antifungal activity of essential oils against Candida albicans isolated from HIV-positive patients.

AUTOR(ES)
FONTE

IBICT

DATA DE PUBLICAÇÃO

23/11/2011

RESUMO

The use of natural products as potent antimicrobial compound has been studied by Dentistry, especially in combating diseases caused by oral biofilms such as dental caries and oral candidiasis. The aim of this study was to evaluate the antifungal activity of essential oils from Ocimum basilicum L (basil), Cymbopogon martinii Motia (palmarosa), Cyperus articulatus L. (piprioca), Thymus vulgaris (thyme) and Cinnamomum cassia L (cinnamom) against strains of Candida albicans isolated from HIV-positive patients, and pattern strain PC (ATCC 76485). The Clinical Mycology Laboratory from Federal University of Paraiba provided fifteen clinical samples of C. albicans (C1-C15), which were kept in Sabouraud Dextrose agar. The assays to determine the antifungal actions were: screening to select oils with antifungal activity, and the determination of Minimum Inhibitory Concentration (MIC), by microdilution technique, of essential oils from O. basilicum, C. martinii, T. vulgaris and C. cassia, with concentrations ranging between 1024 μg/mL to 4μg/mL. After, the effect of essential oil from C. cassia on the microbial death curve was determined by kinetics assay, against samples C-02 and PC, at concentrations CIM, 2xCIM and 4xCIM, and times 0, 0.5, 1, 2, 3, and 24 hours. Furthermore, the micro-morphological changes caused by essential oil from C. cassia, at concentrations CIM, 2xCIM and 4xCIM, was accessed by determination of presence of blastoconides, clamidoconides and pseudohyphae. Controls were performed for yeast growth but also to standard antifungal nystatin and miconazole (50μg/mL). After screening, it was observed that the values of inhibition zones caused by essential oils from O. basilicum, C. martinii, T. vulgaris and C. cassia ranged between 27 and 30mm. The essential oil from C. articulatus showed no activity against the strains. Regarding the MIC, against PC, the essential oil from C. cassia inhibited at concentration 64μg/mL, and C. martini at concentration 1024μg/mL. For the clinical strains, the MIC of essential oil from C. cassia varied between 64 and 128μg/mL. For 66.6% of clinical samples, the MIC of C. martinii was 612μg/mL. The other oils showed no effect against the yeasts growth. Regarding the kinetics assay, the essential oil from C. cassia presented antifungal activity at all times and concentrations analyzed (MIC, 2xMIC and 4xMIC). Considering the morphological changes observed to C. albicans, the absence of pseudohyphae and presence of rare clamidoconides was found after application of essential oil from C. cassia at MIC concentration. The essential oils from C. cassia and C. martini showed antifungal activity, at different concentrations, against yeasts of Candida albicans isolated from HIV-positive patients, and pattern strain PC (ATCC 76485). The essential oil from C. cassia presented effect on the microbial death curve, as well as changed the morphology of clinical and pattern samples.

ASSUNTO(S)

infecções por hiv óleos essenciais candidíase oral candida albicans odontologia oral candidiasis candida albicans essential oils hiv infections

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