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Green synthesized silver nanoparticles demonstrating enhanced in vitro and in vivo antibiofilm activity against Candida spp.

Muthamil, Subramanian, Devi, Vivekanandham Amsa, Balasubramaniam, Boopathi, Balamurugan, Krishnaswamy, Pandian, Shunmugiah Karutha
Journal of basic microbiology 2018 v.58 no.4 pp. 343-357
Candida, Dodonaea viscosa, Fourier transform infrared spectroscopy, Hyptis, X-ray diffraction, antifungal agents, antimicrobial properties, aspartic proteinases, biofilm, biosynthesis, candidiasis, drug resistance, exopolysaccharides, fungi, leaf extracts, light scattering, medical equipment, nanosilver, pathogens, scanning electron microscopy, virulence, zeta potential
Candida species are opportunistic fungal pathogens, which are known for their biofilm associated infections on implanted medical devices in clinical settings. Broad spectrum usage of azole groups and other antifungal agents leads to the occurrence of drug resistance among Candida species. Most of the antifungal agents have failed to treat the biofilm mediated Candida infections. In the present study, silver nanoparticles (AgNPs) were synthesized using Dodonaea viscosa and Hyptis suoveolens methanolic leaf extracts and characterized by ultraviolet‐visible absorption spectroscopy, X‐ray diffraction analysis, Fourier transform infrared spectroscopy and Scanning electron microscopy, Dynamic light scattering, and Zeta potential analysis. The main goal of this study was to assess the AgNPs for their antibiofilm efficacy against Candida spp. through microscopic analysis and in vitro virulence assays. The results revealed that AgNPs strongly inhibited more than 80% biofilm formed by Candida spp. Furthermore, the AgNPs also reduced the yeast‐to‐hyphal transition, exopolysaccharide biosynthesis, secreted aspartyl proteinase production which are the major virulence factors of Candida species. This study reveals that biosynthesized AgNPs can be considered for the treatment of biofilm related Candida infections.