Dbiogenic synthesis,characterization of silver nanoparticles using Multani mitti (Fullers earth),Tomato (Solanum lycopersicum) seeds,Rice Husk (Oryza sativa) and evaluation of their potential antimicrobial activity

The synthesis of silver nanoparticles of three different biogenic materials multani mitti (fullers earth),tomato (solanum lycopersicum) seeds,rice husk (oryza sativa) was carried out. the possible presence and variability of comprehensive biomolecules in these materials turned as capping and reducing agents which optimize the reduction rate and stabilization of silver nanoparticles. characterizations were determined by using ultraviolet-visible (uv-vis) spectroscopy,scanning electron microscope (sem),fourier transform infrared spectroscopy (ftir) and x-ray diffraction (xrd). stable silver nanoparticles of average size 4.6,41.1 and 10.6 nm were obtained for multani mitti,tomato seeds and rice husk respectively. phenolic and carboxylic biomolecules were identified as active reducing agents of ag+2 to ag0. the antimicrobial activity was carried out against klebsiella pneumonia,salmonella enterica,escherichia coliand staphylococcus aureus strains by using well diffusion method. maximum zone of inhibition (zoi) was found against staphylococcus aureus by all of the three biogenic materials.