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Given the increased antimicrobial resistance, global effort is currently focused on the identification of novel compounds, both of natural and chemical origin. The present study reports on the antifungal potential of 1-(1 H -indol-3-yl) derivatives, previously known as tyrosinase inhibitors. The effect of seven compounds (indicated as 3a - g ) was determined against Candida albicans ATCC 10531, three clinical isolates of Candida albicans , two clinical isolates of Candida glabrata , two clinical isolates of Candida parapsilosis and Aspergillus niger ATCC 16404. The effect of these derivatives on tyrosinase enzymatic activity was also evaluated. Results showed a fungicidal activity of compounds 3b , 3c and 3e against all tested strains at concentrations ranging between 0.250 and 1 mg/mL. Furthermore, the association between 3c and fluconazole and between 3b and caspofungin showed a trend of indifference tending toward synergism. Compound 3c was also able to inhibit microbial tyrosinase up to ~28% at the concentration of 0.250 mg/mL. These data could help provide novel therapeutics for topical use to treat fungal infections and increase the potential effectiveness of the association between novel compounds and commercial antifungals in order to combat drug resistance.

The In Vitro Potential of 1-(1H-indol-3-yl) Derivatives against Candida spp. and Aspergillus niger as Tyrosinase Inhibitors