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Colloids Surf B Biointerfaces. 2007 May 15;57(1):97-101. Epub 2007 Feb 1.

A novel extracellular synthesis of monodisperse gold nanoparticles using marine alga, Sargassum wightii Greville.

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  • 1Department of Zoology, Thiruvalluvar University, Vellore 632004, India.


The process of development of reliable and eco-friendly metallic nanoparticles is an important step in the field of nanotechnology. To achieve this use of natural sources like biological systems becomes essential. In the present, work we have investigated extracellular biosynthesis of gold nanoparticles using Sargassum wightii and have achieved rapid formation of gold nanoparticles in a short duration. The UV-vis spectrum of the aqueous medium containing gold ion showed peak at 527 nm corresponding to the plasmon absorbance of gold nanoparticles. Transmission electron microscopy (TEM) showed formation of well-dispersed gold nanoparticles in the range of 8-12 nm. X-ray diffraction (XRD) spectrum of the gold nanoparticles exhibited Bragg reflections corresponding to gold nanoparticles.

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