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Biological synthesis of gold nanoparticles using Magnolia kobus and Diopyros kaki leaf extracts

Paper ID Volume ID Publish Year Pages File Format Full-Text
35065 45071 2009 6 PDF Available
Title
Biological synthesis of gold nanoparticles using Magnolia kobus and Diopyros kaki leaf extracts
Abstract

Leaf extracts of two plants, Magnolia kobus and Diopyros kaki, were used for ecofriendly extracellular synthesis of metallic gold nanoparticles. Stable gold nanoparticles were formed by treating an aqueous HAuCl4 solution using the plant leaf extracts as reducing agents. UV–visible spectroscopy was used for quantification of gold nanoparticle synthesis. Only a few minutes were required for >90% conversion to gold nanoparticles at a reaction temperature of 95 °C, suggesting reaction rates higher or comparable to those of nanoparticle synthesis by chemical methods. The synthesized gold nanoparticles were characterized with inductively coupled plasma spectrometry (ICP), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and particle analysis using a particle analyzer. SEM and TEM images showed that a mixture of plate (triangles, pentagons, and hexagons) and spherical structures (size, 5–300 nm) were formed at lower temperatures and leaf broth concentrations, while smaller spherical shapes were obtained at higher temperatures and leaf broth concentrations.

Keywords
Biological synthesis; Gold; Nanoparticles; Plant extracts; Magnolia kobus; Diopyros kaki
First Page Preview
Biological synthesis of gold nanoparticles using Magnolia kobus and Diopyros kaki leaf extracts
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 10, October 2009, Pages 1133–1138
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering