Volume : IV, Issue : I, January - 2014

Green Synthesis of Gold Nanoparticles Using Cyanobacteria and their Characterization

Dipannita Parial, Ruma Pal

Abstract :

Two cyanobacteria Lyngbya majuscula and Spirulina subsalsa were used as bioreagent for the green synthesis of gold nanoparticles. Within 72 h of incubation at 15 mg L^-1 Au³⁺ solution, the cyanobacterial biomass turned purple indicating intracellular reduction of Au³⁺ to Au⁰ and subsequent formation of gold nanoparticles. Gold nanoparticles were extracted from the gold-loaded biomass using 7.5 mM sodium citrate solution and characterization was done by UV-visible spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM), X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). While Spirulina showed synthesis of spherical nanoparticles of ~5 nm -30 nm diameter along with very few nanorods, Lyngbya showed presence of spherical and hexagonal nanoparticles of ~2 nm -25 nm diameters. XRD study confirmed the reduction of Au³⁺ to Au⁰. FTIR analysis indicated the presence of protein shells around the gold nanoparticles.

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Dipannita Parial, Ruma Pal Green Synthesis of Gold Nanoparticles Using Cyanobacteria and their Characterization Indian Journal of Applied Research, Vol.IV, Issue. I

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