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In this study, nanoparticles (NPs) of poly(lactic-co-glycolic acid) (PLGA) loaded with fluconazole (FLZ) and FLZ-NPs coated with the cationic polymer polyethylenimine (PEI) (FLZ-NP-PEI) were synthetized in order to improve antimycotic activity against four strains of Candida spp. of clinical relevance. FLZ-NPs and FLZ-NP-PEI were synthesized by double emulsion solvent-diffusion (DES-D) and characterized. Minimum inhibitory concentration (MIC 50 ) and minimum fungicide concentration (MFC) were determined in vitro by culturing Candida strains in the presence of these nanocompounds. FLZ-NPs were spherical in shape with hydrodynamic sizes of ~222 nm and surface charge of -11.6 mV. The surface charges of these NPs were successfully modified using PEI (FLZ-NP-PEI) with mean hydrodynamic sizes of 281 nm and surface charge of 23.5 mV. The efficiency of encapsulation (~53%) and a quick release of FLZ (≥90% after 3 h) were obtained. Cytotoxicity assay showed a good cell viability for FLZ-NPs (≥86%), and PEI-modified NPs presented a decrease in cell viability (~38%). FLZ-NPs showed an increasing antifungal activity of FLZ for sensitive ( Candida parapsilosis ATCC22019 and Candida albicans ATCC10231, MIC 50 =0.5 and 0.1 µg/mL, respectively) and resistant strains ( Candida glabrata EMLM14 and Candida krusei ATCC6258, MIC 50 =0.1 and 0.5 µg/mL, respectively). FLZ-NP-PEI showed fungicidal activity even against C. glabrata and C. krusei (MFC =4 and 8 µg/mL, respectively). MIC 50 values showed best results for FLZ-NPs and FLZ-NP-PEI. Nevertheless, only FLZ-NP-PEI displayed fungicidal activity against the studied strains.

nanotechnology, science and applications

Synthesis, characterization, and in vitro activity against &lt;em&gt;Candida&lt;/em&gt; spp. of fluconazole encapsulated on cationic and conventional nanoparticles of poly(lactic-co-glycolic acid)