ISSN: 0973-7510

E-ISSN: 2581-690X

Ibrahim Ali Noorbatcha , Saifunnasr Zulkifli and Mohd Hamzah Salleh
Department of Biotechnology Engineering, Faculty of Engineering, International Islamic University Malaysia, Jalan Gombak 53100 Kuala Lumpur, Malaysia.
J Pure Appl Microbiol. 2014;8(Spl. Edn. 1):881-884
© The Author(s). 2014
Received: 08/01/2014 | Accepted: 24/03/2014 | Published: 31/05/2014
Abstract

The green synthesis of nanoparticles that have environmentally acceptable solvent systems and eco-friendly reducing agents is of great importance. Meanwhile, the synthesis of metal nanoparticles of different sizes, shapes, chemical composition and controlled monodispersity is a key area of research in nanotechnology because of their fascinating physical properties and technological applications. As such, biosynthesis of gold nanoparticles with small size and biostability is vital and used in various biomedical applications. In this paper we report the extracellular biosynthesis of gold nanoparticles (AuNPs) using Candida cylindracea (also known as Candida rugosa), yeast. In the biosynthesis of AuNPs using this yeast, the cultured yeast was exposed to the chloroaurictrihydrate. The bioreduction process involves Au+ ions which are reduced to metallic AuNPs through the catalytic effect of the extracellular enzyme. These gold nanoparticles were characterized by the means of UV–Vis spectroscopy,transmission electron microscopy (TEM), X-ray Diffraction spectrum (XRD) and Fourier transform infrared spectroscopy (FTIR), UV–visible spectrum of the aqueous medium containing auric ion showed a peak at 530 nm corresponding to the surface plasmonresonance of gold nanoparticles. The intensity of the colour was found to increase with respect of time. TEM micrograph showed the formation of well-dispersed gold nanoparticles in the range of 10–30 nm with spherical and triangular shape. Fourier transform infrared spectroscopy revealed possible involvement of reductive groups on the surfaces of nanoparticles. Hence the present study enlightens the green chemistry approach on the production of gold nanoparticles using a microorganism. In comparison to chemical synthesis, the synthesis of gold nanoparticles by microbial source is an environmental friendly method for AuNP production.

Keywords

Gold Nanoparticles, Extracellular Biosynthesis, Surface plasmon resonance. Transmission Electron Microscope

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© The Author(s) 2014. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.