Journal of Nanomedicine & Nanotechnology

Studies on antibacterial activity of ZnO nanoparticles by ROS induced lipid peroxidation

4^th International Conference on Nanotek & Expo

December 01-03, 2014 DoubleTree by Hilton Hotel San Francisco Airport, USA

Bhavani Prasad Naik

Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

Recent studies indicated the role of ROS toward antibacterial activity. In our study we report ROS mediated membrane lipid oxidation of Escherichia coli treated with ZnO nanoparticles (NPs) as supported by detection and spectrophotometric measurement of malondialdehyde (MDA) by TBARS (thiobarbituric acid-reactive species) assay. The antibacterial effects of ZnO NPs were studied by measuring the growth curve of E. coli, which showed concentration dependent bacteriostatic and bactericidal effects of ZnO NPs. The antibacterial effects were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Further, antibacterial effect of ZnO NPs was found to decrease by introducing histidine to the culture medium treated with ZnO NPs. The ROS scavenging action of histidine was confirmed by treating histidine to the batch of Escherichia coli + ZnO NPs at the end of the lag phase of the growth curve (Set-I) and during inoculation (Set-II). A moderate bacteriostatic effect (lag in the E. coli growth) was observed in Set-II batch while Set-I showed no bacteriostatic effect. From these evidences we confirmed that the antibacterial effect of bare as well as TG capped ZnO NPs were due to membrane lipid peroxidation caused by the ROS generated during ZnO NPs interaction in culture medium.

Biography :

Bhavani Prasad Naik is currently a post-doctoral research fellow at the Zhejiang University, China under the supervision of Prof. Hongzhanglian. He received his PhD degree in 2013, from Indian Institute of Technology, Roorkee, India under the guidance of Dr. Raj Kumar Dutta, where he carried out studies on antibacterial and photocatalytic applications of ZnO nanoparticles. He is currently working on the photocatalytic properties and applications of graphene-metal oxide nanocomposites. His scientific interests focus on synthesis and tuning of graphene-metal oxides nanocomposites and to study the effect of their optoelectronic and morphological properties in photocatalysis, water splitting and super capacitors etc.