title: Green synthesis of gold nanoparticles using Nyctanthes arbortristis flower extract.
abstract: 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 Au(3+) 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.
authors.affiliation: Biomaterials and Tissue Engineering Laboratory, Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
authors.forename: Ratul Kumar
authors.initials: RK
authors.lastname: Das
authors.forename: Nayanmoni
authors.initials: N
authors.lastname: Gogoi
authors.forename: Utpal
authors.initials: U
authors.lastname: Bora
mesh_terms: D002712:Chlorides / Q000737:chemistry; D035264:Flowers / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D017612:Gold Compounds / Q000737:chemistry; D055772:Green Chemistry Technology / Q000379:methods*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D029592:Oleaceae / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D002712:Chlorides; D017612:Gold Compounds; D010936:Plant Extracts; D006046:Gold; C024568:gold tetrachloride, acid