Combination of CuO nanoparticles and fluconazole: preparation, characterization, and antifungal activity against Candida albicans
Combination therapy becomes an important strategy in the management of invasive fungal infections and emergence of resistant fungi mutants. In this work, we examine the combination of copper oxide (CuO) nanoparticles (NPs) with fluconazole as potential treatment against the pathogenic fungi, Candida albicans. CuO NPs (~7 nm in size) were synthesized with acetate ligands assembled on their surface, as shown by both thermal gravimetric analysis and FTIR spectroscopy. Unlike the commercial CuO (both bulk and 50 nm particles), that are poorly dispersed in water, the interaction with water allows the fine dispersion of the coated CuO NPs and their excellent colloidal stability. The addition of fluconazole to the aqueous CuO dispersion induced spontaneous self-assembly of the NPs into linear pearl-like chains network, shown by cryogenic transmission electron microscopy (cryo-TEM). The antifungal activity of the CuO NPs and their combination with fluconazole (fluconazole–CuO NPs) was studied against C. albicans. The best MIC values were obtained at concentrations as low as 0.2 and 0.3 mg/mL, respectively. The results suggest that fluconazole–CuO NPs can provide a potential alternative treatment for C. albicans infections.
KeywordsCopper oxide Nanoparticles Antifungal Candida albicans Fluconazole Functionalization Health effects
This work was supported by a grant from the ORT Braude College research committee. The authors would like to thank Dr. Yishay Feldman (X-ray Diffraction Lab, Department of Chemical Research Support, Weizmann Institute of Science), Dr. Ellina Kesselman (Microscopy Research Engineer at the Technion), Dr. Giorgi Shtenberg, and Dr. Naama Massad-Ivanir for their assistance during this work.
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