Green Synthesis of Plant Mediated Silver Nano Particles and Evaluation of their Antimicrobial Activities

There is an increasing commercial demand for nanoparticles due to their wide applicability in various areas such as electronics; catalysis, chemistry, energy, and medicine Nanoparticles are prepared by a variety of chemical methods which are not environmentally friendly. We report a rapid and convenient method to reductively prepare silver nanoparticles using silver nitrate In this report we use aqueous extracts from plants namely Morinda tinctoria, Michelia champaca. The extracts template the reductive preparation of silver nano particles which are found to be < 100 nm in size. The synthesized compounds are characterized by FT-IR, UV_VIS and XRD data.  Green synthesized silver nanoparticles showed antibacterial activity against two Gram-positive bacteria Staphylococcus aureus, Bacillus subtilis and two Gram-negative bacteria Pseudomonas aeruginosa, Escherichia coli and antifungal activity against Candida albicans, Aspergillus niger and Cryptococcus neoformans.  The synthesized nano particles were found to be highly toxic against different multi drug resistant human pathogens