Journal of Nanomedicine & Nanotechnology

Nanocomposites based on rice straw and silver nanoparticles: Effect of pH and in vitro antibacterial activity

6^th Global Experts Meeting on Nanomaterials and Nanotechnology

April 21-23, 2016 Valencia, Spain

Roshanak Khandanlou, Ngoh Gek Cheng and Chong Wen Tong

University of Malaya, Malaysia

Posters & Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

To investigate the influence of pH on the size and distribution of the silver nanoparticles (Ag-NPs) and the antibacterial activity of rice straw/silver nanocomposites (RS/Ag-NCs), Ag-NPs were synthesisd on the rice straw (RS) surface with various percentages of Ag-NPs] 1.0, 5.0, 10.0 and 20.0 wt.%[, under temperature and divers pH by using urea and sodium hydroxide as stabilizer and reducing agent, respectively. The ultraviolet-visible spectroscopy of synthesised RS/Ag-NCs became noticeable with the increase of pH, the peaks were blue-shifted to lower wavelength. X-ray powder diffraction (PXRD) demonstrated the presence of pure Ag- NPs. Transmission electron microscopy (TEM) showed that the diameter of Ag-NPs on RS were from 7.78 to 2.84 nm at pH 8 to 10. The antibacterial activity of Ag-NPs on RS was examined using gram-negative bacteria (i.e., Escherichia coli) and Gram-positive bacteria (i.e., Staphylococcus aureus) based on the well diffusion technique at various sizes of Ag-NPs. Higher antibacterial activity was detected as the loading percentage of RS/Ag-NCs increased with the decrease in particle size.

Biography :

Email: roshanak_bch@yahoo.com