Efeitos da terapia fotodinâmica antimicrobiana em leveduras do gênero Candida

Abstract

The aim of this study was to evaluate the effects of photodynamic therapy using methylene blue on Candida strains. Were studied: 5 C. albicans, 4 C. tropicalis, 4 C. glabrata 2 C. parapsilosis, 2 C. kefyr, 1 C. stellatoidea, 1 C. krusei and 1 C. lipolytica. Each strain was underwent to four experimental conditions: methylene blue laser (L+P+) irradiation with laser (L+P-), treatment with methylene blue (L-P+), and treatment with saline as control group (L-P-). After treatment of each strain and plating serial dilutions on Sabouraud dextrose agar were performed. The data from colony forming units per milliliter (CFU/ml) were analyzed by ANOVA and Tukey test (p <0.05). The results suggest that the groups treated with laser (L+ P+ and L+P-) showed average CFU/ml (Log) lower than without laser treatment groups (L-F- e L-F+). The group with photodynamic therapy (L+P+) showed an average CFU/ml (Log) similar to the group (L+P-). It was concluded that the strains of Candida analyzed were sensitive to laser irradiation of low power in the presence or absence of methylene blue.