Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 15, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-013-2031-5
Keywords
Iron oxide nanoparticles; Biosynthesis; Soil fungi; Extracellular proteins; Aspergillus japonicus; Nanobiotechnology
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Funding
- Indian Council of Agricultural Research, Government of India [NAIP/C4/C-2032]
- Council of Scientific and Industrial Research, Government of India
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In the present study, extracellular synthesis of iron oxide nanoparticles (IONPs) was achieved using Aspergillus japonicus isolate AJP01. The isolate demonstrated its ability to hydrolyze the precursor salt solution, a mixture of iron cyanide complexes, under ambient conditions. Hydrolysis of these complexes released ferric and ferrous ions, which underwent protein-mediated coprecipitation and controlled nucleation resulting in the formation of IONPs. Transmission electron microscopy, selected area electron diffraction pattern, energy dispersive spectroscopy and grazing incidence X-ray diffraction analysis confirmed the mycosynthesis of IONPs. The synthesized particles were cubic in shape with a size range of 60-70 nm with crystal structure corresponding to magnetite. Scanning electron microscopy analysis revealed the absence of IONPs on fungal biomass surface, indicating the extracellular nature of synthesis. Fourier transform infrared spectroscopy confirmed the presence of proteins on as-synthesised IONPs, which may confer their stability. Preliminary investigation indicated the role of proteins in the synthesis and stabilization of IONPs. On the basis of present findings, a probable mechanism for synthesis of IONPs is suggested. The simplicity and versatility of the present approach can be utilized for the synthesis of other nanomaterials.
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