Title:Green Synthesis of Gold Nanoparticles Using Tamarindus indica Extract as a Bioreductant
VOLUME: 5 ISSUE: 2
Author(s):Pradyumn Gourav and Syed H. Hasan
Affiliation:Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi- 221005, India.
Keywords:Bioreductant, green synthesis, gold nanoparticles, stabilizers, tamarind extract.
Abstract:Over the last few decades, economically viable, straightforward and green route for the
synthesis of nanomaterial has drawn the attention of researchers in the area of nanoscience and
technology. Applications of economical and non-toxic chemicals, environmentally safer solvents and
renewable products materials are the advantages of nanoscience and technology considering
researchers to use green route for large scale manufacturing. It is well documented that the synthesis
and stabilization of nanomaterials usually depends upon reaction medium, reducing agents (RA) and
capping agent, that is why these three factors must be taken into the consideration comprehensively
from an economic and green chemistry perspective. A novel green approach for the synthesis of gold nanoparticles has
been proposed over here by using fruit extract of Tamarindus indica fruit extract (TIFE). When 2 mL of TIFE was added
into 2 mL of 1 mM tetrachloroauric acid solution the color changed from light yellow to purple brown was observed
indicating the formation of Gold nanoparticles. It was confirmed by UV-Visible spectroscopy showing a sharp peak at 540
nm. Transmission Electron Microscopy (TEM) an EDAX analyses indicated that the shapes and sizes of formed gold
nanoparticles were depending upon the reaction conditions. X-Ray diffraction pattern indicated that the synthesized
nanoparticles were purely face centered cubic crystal. The gold nanoparticles were found to have significant in vitro
stability. The mechanism of formation of gold nanoparticles has been explored and it was found that tartaric acid and
glucose which were the major active constituents of the TIFE, were behaving as a bioreductants as well as capping agents.
