期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 260, 期 -, 页码 878-884出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2013.06.003
关键词
Exiguobacterium sp KNU1; Silver nanoparticles; Antimicrobial activity; Single cell gel electrophoresis; Scanning electron microscopy
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2010-0023442, 2013R1A1A4A01008000]
- Kyungpook National University Research Fund
- Priority Research Centers Program through the NRF
- MEST [2010-0028301]
- National Research Foundation of Korea [2010-0023442] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The development of eco-friendly and reliable processes for the synthesis of nanoparticles has attracted considerable interest in nanotechnology. In this study, an extracellular enzyme system of a newly isolated microorganism, Exiguobacterium sp. KNU1, was used for the reduction of AgNO3 solutions to silver nanoparticles (AgNPs). The extracellularly biosynthesized AgNPs were characterized by UV-vis spectroscopy, Fourier transform infra-red spectroscopy and transmission electron microscopy. The AgNPs were approximately 30 nm (range 5-50 nm) in size, well-dispersed and spherical. The AgNPs were evaluated for their antimicrobial effects on different gram negative and gram positive bacteria using the minimum inhibitory concentration method. Reasonable antimicrobial activity against Salmonella typhimurium, Pseudomonas aeruginosa, Escherichia calf and Staphylococcus aureus was observed. The morphological changes occurred in all the microorganisms tested. In particular, E. calf exhibited DNA fragmentation after being treated with the AgNPs. Finally, the mechanism for their bactericidal activity was proposed according to the results of scanning electron microscopy and single cell gel electrophoresis. (C) 2013 Elsevier B.V. All rights reserved.
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