3RD INTERNATIONAL CONGRESS ON TECHNOLOGY - ENGINEERING & SCIENCE - Kuala Lumpur - Malaysia (2017-02-09)

Sustainable Synthesis Of Silver And Ferromagnetic Iron Oxide Nanoparticles From Locally Isolated Aquatic Bacteria

Metal oxide nanoparticles (IONP) have found a wide range of applications in microelectronics, biodiagnostics, cellular therapy and in environmental remediation. As such, the design of well-defined metal oxide nanoparticles such as silver and iron oxide have become an essential tool. Fabrication of these nanostructures using currently employed chemical and physical methods are not environmentally conducive and weigh heavily on energy and outlays. Certain microorganisms, when confronted with a high concentration of metallic ions in their environment, possess survival mechanisms that reduce these metallic ions in colloidal solution to generate nanoparticles. Hence, harnessing this potential is a way forward in constructing microbial nanofactories, capable of churning out high yields of well-defined iron oxide and silver nanoparticles. In this work, we report the isolation and characterization of local bacterial strains, isolated from the tropical freshwater and marine ecosystems Malaysia that demonstrate the ability to reduce ferric and silver ions in aqueous solution. These aerobic isolates survived and performed well under ambient temperature and humidity and demonstrated facile, rapid synthesis. The nanoparticles generated were characterized using FESEM, UV-Vis Spectrophotometry, FTIR and DLS. Characterization of these nanoparticles showed that they had narrow size distribution and did not require any additional capping or stabilizing agent in colloidal solution. We therefore conclude that these isolates are choice microbial nanofactories which should be further worked on to generate metallic oxide nanoparticles on the large scale.
Patricia Jacob, Jaffri Masarudin, Zobir Hussein, Raha Abd Rahim