Understanding the stability of silver nanoparticles bio-fabricated using Acacia arabica (Babool gum) and its hostile effect on microorganisms

We report green synthesis of stable silver nanoparticles (SNPs) from Acacia arabica gum and its anti-bacterial activity against gram-positive and gram-negative bacteria. UV-Vis spectral analysis of synthesized SNPs showed maximum peak at 462 nm initially and 435 nm after 24 h. Using Transmission Electron microscopy (TEM), the average size of synthesised SNPs was found to be similar to 35 nm. X-ray diffraction (XRD) and Selective area electron diffraction (SAED) pattern confirmed the crystalline nature of SNPs. Percentage conversion of Ag+ ions into Ag degrees was calculated using ICP-AES and was found to be 94%. By calculating flocculation parameter, we could see that these SNPs are extremely stable under the influence of very high NaCl concentration up to 4.16 M. These stable SNPs can be used in various industrial and medical applications. (C) 2013 Elsevier B.V. All rights reserved.