Facile synthesis of silver nano particles with highly efficient anti-microbial property

A simple surfactant assisted aqueous solution approach, based on the conventional Tollen’s reaction has been applied for the facile syntheses of silver nano-assembly. Nano particle morphologies strongly depend on the temperature adopted during the synthesis. Two-dimensional (2 D) nano-disks and three-dimensional (3D) nano-globules with “Cauliflower” like morphology were observed. The unique and distinctive feature of the synthesized silver nano particle in solution is its very high anti-microbial activity. This is evident in very low (4 μg/ml) inhibitory concentration (MIC) value for Escherichia coli, Vibrio cholerae, Shigella flexneri, Salmonella typhimurium and three varieties of Staphylococcus aureus. This low MIC value is comparable to that of Penicillin and in the cases of E. coli and S. aureus (ML 422), the MIC value is as low as 2 μg/ml which beats even Penicillin.

Tollen’s reaction in presence of an anionic surfactant SDS has been employed for the facile syntheses of higher dimensional silver nano-structures in the temperature range 80–86 °C. Anti-microbial activity of the nano particles was established against seven bacterial strains.Figure optionsDownload as PowerPoint slide