Abstract
This report provides for the first time rapid novel environment friendly cell surface based synthesis of stable gold nanoprisms at room temperature using Penicillium citrinum MTCC9999 biomass. The UV-Visible spectral scan of dispersed gold nanoparticles (GNPs) solution showed absorption maxima at 540 nm due to surface plasma resonance (SPR) of gold nanoparticles. Typical Transmission Electron Microscopic (TEM) images showed that most of them were prism (55%) shaped with a diameter ranging from 20 - 40 nm. These results obtained from TEM correlated well with the data obtained from Dynamic Light Scattering (DLS) experiment. Average zeta potential of GNPs was -20 mV suggesting some biomolecules capped the nanoparticles imparting a net negative charge over it. FTIR analysis also showed that protein molecules were involved in stabilization.
Highlights
In recent years the synthesis of stable gold nanoparticles is one of the most active areas of research in the field of nanotechnology because of their applications in a number of areas like bio-imaging, bio-medicine, bio-sensors, bio-labels, catalysis and others [1,2,3,4,5]
This report provides for the first time rapid novel environment friendly cell surface based synthesis of stable gold nanoprisms at room temperature using Penicillium citrinum MTCC9999 biomass
We report for the first time a cell surface based synthesis of prism shaped gold nanoparticles of smaller diameter 20 - 40 nm by reducing chloroauric acid (HAuCl4·3H2O) at room temperature using Penicillium citrinum MTCC9999 biomass and characterized the gold nanoparticles using UV-Visible Spectroscopy, Transmission Electron Micrograph (TEM), Dynamic Light Scattering (DLS) and Fourier Transformed Infra Red Spectroscopy (FTIR)
Summary
In recent years the synthesis of stable gold nanoparticles is one of the most active areas of research in the field of nanotechnology because of their applications in a number of areas like bio-imaging, bio-medicine, bio-sensors, bio-labels, catalysis and others [1,2,3,4,5]. A growing demand has been accumulated to develop environment friendly approaches to synthesize nanomaterials (Green Chemistry). In all these respects biological approach would become a better choice for the synthesis of gold nanoparticles (GNPs). Escherichia coli has been found to secrete proteins with specific polypeptide repeat sequences have been shown to synthesize flat, triangular gold nanocrystals with a relative yield of 4% to the total nanoparticle production [18]. It is advantageous to use fungi over bacteria for development of natural “nano-factories” because the handling of fungal biomass will be much simpler [19]
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