One-Pot Synthesis and Antifungal Activity of Nontoxic Silver-Loaded Hydroxyapatite Nanocomposites against Candida Species

Autor(es)

Gottardo, Bianca ^[1] ; Lemes, Thiago H. ^[1] ; Byzynski, Gabriela ^[2] ; Paziani, Mario H. ^[3] ; von-Zeska-Kress, Marcia R. ^[3] ; de Almeida, Margarete T. G. ^[2] ; Volanti, Diogo P. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Inst Biosci Humanities & Exact Sci, R Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[2] Sao Jose do Rio Preto Med Sch FAMERP, Ave Brigadeiro Faria Lima 5416, BR-15090000 Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Sao Paulo, Sch Pharmaceut Sci Ribeirao Preto, Ave Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED NANO MATERIALS; v. 2, n. 4, p. 2112-2120, APR 2019.
• Citações Web of Science: 1

Resumo

The impact of fungal diseases and the development of antimicrobial agents against pathogenic fungi have emerged as a main global healthcare challenge. In this study, the antifungal activity of silver-loaded hydroxyapatite (Ag/HAP) nanocomposites (NCs) with different Ag content synthesized by a one-pot microwave assisted solvothermal method was evaluated against sensitive and resistant Candida species. The NCs' composition and morphology were characterized by X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and high-resolution transmission electron microscopy analysis. Antifungal studies were conducted by a microdilution method according to a protocol from the Clinical and Laboratory Standards Institute. The main inhibitory effect was observed against Candida krusei, with a minimum inhibitory concentration (MIC) of 31.2 mu g/mL, followed by Candida parapsilosis sensu stricto and Candida tropicalis (62.5 mu g/mL) and Candida glabrata and Candida albicans (125 mu g/mL). Furthermore, a toxicity assay was performed in the in vivo model Galleria mellonella by bathing or inoculating with the same NC concentration used in the previously mentioned microdilution experiments. For both approaches, all NC concentrations were not toxic in the in vivo model. The specific antifungal activity demonstrated that NCs act efficiently against species of Candida. These results show a potential antifungal application for well-designed nanostructured Ag/HAP composites. (AU)

• Processo FAPESP: 17/01267-1 - Compósitos de ácido grafênico-óxidos metálicos ocos para sensor de gás
• Beneficiário: Diogo Paschoalini Volanti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/04511-5 - Avaliação da atividade fotocatalítica e mecanismos de degradação de heteroestruturas de semicondutores dopados e grafeno
• Beneficiário: Gabriela Byzynski Soares
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado