Green synthesis of gold nanoparticles using Nyctanthes arbortristis flower extract
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The present study explores the reducing and capping potentials of ethanolic flower extract of the plant Nyctanthes arbortristis for the synthesis of gold nanoparticles. The extract at different volume fractions were stirred with HAuCl4 aqueous solution at 80 °C for 30 min. The UV–Vis spectroscopic analysis of the reaction products confirmed successful reduction of Au3+ ions to gold nanoparticles. Transmission electron microscope (TEM) revealed dominant spherical morphology of the gold nanoparticles with an average diameter of 19.8 ± 5.0 nm. X-ray diffraction (XRD) study confirmed crystalline nature of the synthesized particles. Fourier transform infra-red (FTIR) and nuclear magnetic resonance (NMR) analysis of the purified and lyophilized gold nanoparticles confirmed the surface adsorption of biomolecules during preparation and caused long-term (6 months) stability. Low reaction temperature (25 °C) favored anisotropy. The strong reducing power of the flower extract can also be tested in the green synthesis of other metallic nanoparticles.
KeywordsFlower extract Phytochemicals Gold nanoparticles Nucleation Capping
This work was accomplished with the funds provided by Department of Science and Technology (DST), Government of India. NG thanks MHRD for the research fellowship. We are also thankful to Prof. S.K. Borthakur (Department of Botany, Guwahati University, Guwahati, Assam, India) for helping us in identification of the flower used in the present study.
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