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Title Brown seaweed Sargassum polycystum (C. Agardh) extract as mediator in the green synthesis of colloidal gold nanoparticles from Malita, Davao Occidental Philippines
Posted by Franco Teves
Authors Lumogdang, Leonel; Teves, Franco
Publication date 2020
Journal International Journal of Biosciences
Volume 6
Issue 4
Pages 404-417
Publisher INNSPUB
Abstract One of the paradigm shifts in the field of nanotechnology is the development of environmentally friendly, biocompatibility and green approaches in the synthesis of metal nanoparticles. In this study, the extracts of Brown seaweed, Sargassum polycystum (C. Agardh) were utilized as reducing agents in the green synthesis of gold nanoparticles. The produced gold nanoparticles were characterized using UV-visible spectroscopy, Fourier Transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDS) spectroscopy. The different volumes of brown seaweed extract namely 25, 20, 15, 10 and 5ml when added with Tetrachloroauric acid gradually changed from color brown to ruby red, a characteristics reaction of gold nanoparticles. UV-vis spectral analysis of the gold nanoparticles showed strong peaks around 526nm to 548nm, an optical characteristic of gold nanoparticles. The presence of elemental gold was also confirmed by the EDS analysis. The SEM image of the gold nanoparticles clusters of spherical morphology with a size range of 68.5 to 240nm. The FTIR spectra of the brown seaweed mediated synthesized gold nanoparticles showed strong peaks corresponding to hydroxyl groups, and primary amines functionalities which probably acted as reducing agent, stabilizing agent and capping agent during the synthesis of gold nanoparticles.
Index terms / Keywords Brown Seaweed, Sargassum polycystum, Reducing agent, Green synthesis, Gold nanoparticles