Mycogenesis of cerium oxide nanoparticles using Aspergillus niger culture filtrate and their applications for antibacterial and larvicidal activities
Autor(es): Gopinath, K.; Karthika, V.; Sundaravadivelan, C.; Gowri, S.; Arumugam, A.
Resumo: Cerium oxide nanoparticles (CeO sub(2) NPs) were synthesized using Aspergillus niger culture filtrate. The mycosynthesized CeO sub(2) NPs were characterized by UV-Visible (UV-Vis), Fourier Transform Infrared (FT-IR), X-ray diffraction (XRD), Micro Raman, Thermogravimetric/Differential Thermal Analysis (TG/DTA), Photoluminescence, and Transmission Electron Microscopy (TEM) analyses. UV-Vis spectrum exhibited a corresponding absorption peak for CeO sub(2) NPs at 296 nm, and the functional groups present in the fungal filtrate responsible for the synthesis of NPs were analyzed by FT-IR. The further characterization of the mycosynthesized CeO sub(2) NPs revealed particles of the cubic structure and spherical shape, with the particle sizes ranging from 5 to 20 nm. The antibacterial activity of CeO sub(2) NPs was examined in respect of two Gram-positive (G+) bacteria (Streptococcus pneumoniae, Bacillus subtilis) and two Gram-negative (G-) bacteria (Proteus vulgaris, Escherichia coli) by disk diffusion method. The test results for CeO sub(2) NPs at a concentration of 10 mg/mL showed higher activities on the zone of inhibition of up to 10.67 plus or minus 0.33 and 10.33 plus or minus 0.33 mm against Streptococcus pneumonia and Bacillus subtilis, respectively, The CeO sub(2) NPs caused 100 % mortality on first instar of Aedes aegypti at 0.250 mg/L concentration after 24-h exposure. The mycosynthesis of CeO sub(2) NPs is a simple, cost-effective and eco-friendly approach and it will also potentially helpful to control pathogenic bacteria and dengue vector. Graphical Abstract: [Figure not available: see fulltext.]
Palavras-Chave: Cerium; Pest control; Transmission loss; Antibiotics; Mortality causes; Antibacterial activity; Dengue; Transmission electron microscopy; Nanoparticles; Streptococcus; Proteus vulgaris; Streptococcus pneumoniae; Aedes aegypti; Bacillus subtilis; Escherichia coli; Aspergillus niger
Imprenta: Journal of Nanostructure in Chemistry, v. 5, n. 3, p. 295-303, 2015.
Descritores: Aedes aegypti - Transmission ; Aedes aegypti - Dengue
Data de publicação: 2015
