Rao , A. and Mahajan , K. and Banker , A. and Rapole , S. and Ravi , A.K. and Gosavi , S. and Zinjarde , S. (2013) Facile synthesis of size-tunable gold nanoparticles by pomegranate (Punica granatum) leaf extract: Applications in arsenate sensing. Materials Research Bulletin , 48. pp. 1166-1173.

Text 40. Dr. Srikant (Mate. Res. Bulle.)-author copy.pdf - Accepted Version Restricted to Registered users only Download (1142Kb) | Request a copy

Abstract

When pomegranate leaf extracts were incubated with chloroauric acid (HAuCl4), gold nanoparticles (AuNPs) were synthesized. These were characterized by a variety of techniques. With an increasing content of the leaf extract, a gradual decrease in size and an increase in monodispersity were observed. Transmission electron microscope (TEM) images showed that the phyto-fabricated AuNPs were surrounded by an amorphous layer. Gallic acid in the extract mediated the reduction and a natural decapeptide capped the nanostructures. Blocking of thiol groups in the decapeptide cysteine residues caused the nanoparticles to aggregate. On interaction with arsenate (V) ions, the UV–vis spectra of the nanoparticles showed a decrease in intensity and a red-shift. Energy dispersive spectra confirmed the presence of arsenate associated with the AuNPs. Thus, by using these AuNPs, a method for sensing the toxic arsenate ions could be developed.

Item Type:	Article
Subjects:	Bioinformatics and Proteomics
Depositing User:	Mr. Rameshwar Nema
Date Deposited:	13 Apr 2015 05:09
Last Modified:	02 Jul 2015 10:49
URI:	http://nccs.sciencecentral.in/id/eprint/44

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