Keywords: Gold Nanoprism; Green Synthesis; Penicillium citrinum; Transmission , triangular gold nano plates using algal solutions of. , S. S. Shankar, A. Rai, B. Ankamwar, A. Singh, A. Ahmad and M. Sastry, “ Biological Synthesis of Triangular Gold Nanoprisms,” Nature Materials, Vol. 3, No . Synthesis of triangular gold nanoprism using lemon grass leaf extract showed UV-Visible spectra of gold nanoparticles by bio-reduction of Chloroauric acid in.
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The patterns of SAED were indexed according to,and reflections of fcc gold on the basis of their d-spacings of 2. FTIR analysis also showed that protein molecules were involved in stabilization.
Sample images were processed using ProScan image processing software. All chemical reagents were purchased from Sigma St.
Then the biomass was harvested by sieving through a plastic filter and washed several times with double distilled water to remove any traces of media components. In our study, GNPs formed a single population in the size range of 10 – 40 nm. Synthesis of spherical gold nanoparticles GNPs have been reported using the fungus Fusarium oxysporum and Verticillium sp. The selected area electron diffraction pattern SAED of gold nanoprism Figure 4 B indicated that the entire nanoparticle was nanocrystalline in nature .
Free amine, carboxyl or phosphate groups present in the protein can interact with gold nanoparticles [32,37] and possibly involved in stabilization of GNPs. Journal of Biomaterials and Nanobiotechnology Vol. The GNPs then resuspended in double distilled water and again centrifuged.
Biological synthesis of triangular gold nanoprisms.
The UV-Visible spectral scan of dispersed gold nanoparticles GNPs solution showed absorption maxima at nm due to surface plasma resonance SPR of gold nanoparticles. FFT image also showed an elongation of the diffraction reflexes. FTIR spectroscopy data also supported the fact that biomolecules were present in the surface.
A Formation of GNPs on mycelial biomass resulting purple ov. Figure 1 B represents GNPs solution collected from mycelial surfaces following synthseis sonication and filtration. Moreover, the synthesis of other anisotropic nanostrctures of gold like nano rod, cube, triangle which are present in smaller quantities as per TEM images may be achieved by further tuning the synthesis protocol using the fungus. Received January 16 th; revised February 23 rd; accepted April 5 th This report provides for the first time rapid novel environment friendly cell surface based synthesis of nanorpisms gold nanoprisms at room temperature using Penicillium citrinum MTCC biomass.
The zeta potential of GNPs was measured to know their colloidal stability and the nature of the charge carried in their surface. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Formation of gold nanoparticles resulted in a sharp colour change from yellow to dark pinkish. The authors would like to thank Shantiswarup Sinha and Prof.
Biological synthesis of triangular gold nanoprisms.
B A selected area electron diffraction pattern of GNPs. Thus biologica, is quite exciting for us to synthesize gold nanoprism for first time using biological approach. Due to symmetric face centered cubic fcc lattice of gold nanoparticles, the formation of anisotropic structures like cube, prism, star, branched nanoparticles require a selective capping agent during growth This microbial synthesis of GNPs could be explained by the fact that microorganisms often face triqngular ions or metals in their environment and thereby developed mechanism to detoxify metals by changing the redox states of metal ions and or intracellular precipitation of metals forming a basis for synthesis of nanoparticles .
Some rod shaped, triangular, cubical, very small circular 3 – 4 nm diameter and rectangular GNPs were present in smaller amounts Figures A and B. FTIR spectra of gold nanoparticles.
For FTIR spectrum analysis the GNPs were centrifuged at 10, rpm for 10 minutes to remove free proteins or other compounds present in the solution.
Biological Synthesis of Colloidal Gold Nanoprisms Using Penicillium citrinum MTCC
Synthesis of triangular gold nanoprism using lemon grass leaf extract showed large size of nanoprisms ranging from – nm length and truncated vertices . By conventional chemical and physical methods nanocubes , nanorods , nanowires , nanoplates  can be synthesized but that require high environmental cost. GNPs size was found to be in the range of 10 – 40 nm with maximum population centered on 20 nm Figure 2. The physical nature of GNPs indicated that most synrhesis the nanoparticles were prism shaped.
Biological systems are capable of synthesizing a remarkably diverse range of inorganic materials.
To investigate the physical nature of gold nanoparticles transmission electron microscopic analysis was done. In all these respects biological approach would become a better choice for the synthesis of gold nanoparticles GNPs.