Andrea Rónavári, Nóra Igaz, Mohana Krishna Gopisetty, Bettina Szerencsés, Dávid Kovács, Csaba Papp, Csaba Vágvölgyi, Imre Miklós Boros, Zoltán Kónya, Mónika Kiricsi, Ilona Pfeiffer

Epidemiologic observations indicate that the number of systemic fungal infections has increased significantly during the past decades, however in human mycosis, mainly cutaneous infections predominate, generating major public health concerns and providing much of the impetus for current attempts to develop novel and efficient agents against cutaneous mycosis causing species. Innovative, environmentally benign and economic nanotechnology-based approaches have recently emerged utilizing principally biological sources to produce nano-sized structures with unique antimicrobial properties. In line with this, our aim was to generate silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) by biological synthesis and to study the effect of the obtained nanoparticles on cutaneous mycosis causing fungi and on human keratinocytes. Cell-free extract of the red yeastPhaffia rhodozymaproved to be suitable for nanoparticle preparation and the generated AgNPs and AuNPs were characterized by transmission electron microscopy, dynamic light scattering and X-ray powder diffraction. Antifungal studies demonstrated that the biosynthesized silver particles were able to inhibit the growth of several opportunisticCandidaorCryptococcusspecies and were highly potent against filamentousMicrosporumandTrichophytondermatophytes. Among the tested species onlyCryptococcus neoformanswas susceptible to both AgNPs and AuNPs. Neither AgNPs nor AuNPs exerted toxicity on human keratinocytes. Our results emphasize the therapeutic potential of such biosynthesized nanoparticles, since their biocompatibility to skin cells and their outstanding antifungal performance can be exploited for topical treatment and prophylaxis of superficial cutaneous mycosis.