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Applied and Environmental Microbiology
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Public Health Microbiology

Antibacterial Activity and Mechanism of Action of the Silver Ion in Staphylococcus aureus and Escherichia coli

Woo Kyung Jung, Hye Cheong Koo, Ki Woo Kim, Sook Shin, So Hyun Kim, Yong Ho Park
Woo Kyung Jung
1Department of Microbiology
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Hye Cheong Koo
1Department of Microbiology
2KRF Zoonotic Disease Priority Research Institute, College of Veterinary Medicine and BK21 Program for Veterinary Science
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  • For correspondence: koohj@snu.ac.kr yhp@snu.ac.kr
Ki Woo Kim
3National Instrumentation Center for Environmental Management, Seoul National University, Seoul, Korea
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Sook Shin
1Department of Microbiology
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So Hyun Kim
1Department of Microbiology
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Yong Ho Park
1Department of Microbiology
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  • For correspondence: koohj@snu.ac.kr yhp@snu.ac.kr
DOI: 10.1128/AEM.02001-07
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ABSTRACT

The antibacterial effect and mechanism of action of a silver ion solution that was electrically generated were investigated for Staphylococcus aureus and Escherichia coli by analyzing the growth, morphology, and ultrastructure of the bacterial cells following treatment with the silver ion solution. Bacteria were exposed to the silver ion solution for various lengths of time, and the antibacterial effect of the solution was tested using the conventional plate count method and flow cytometric (FC) analysis. Reductions of more than 5 log10 CFU/ml of both S. aureus and E. coli bacteria were confirmed after 90 min of treatment with the silver ion solution. Significant reduction of S. aureus and E. coli cells was also observed by FC analysis; however, the reduction rate determined by FC analysis was less than that determined by the conventional plate count method. These differences may be attributed to the presence of bacteria in an active but nonculturable (ABNC) state after treatment with the silver ion solution. Transmission electron microscopy showed considerable changes in the bacterial cell membranes upon silver ion treatment, which might be the cause or consequence of cell death. In conclusion, the results of the present study suggest that silver ions may cause S. aureus and E. coli bacteria to reach an ABNC state and eventually die.

  • Copyright © 2008 American Society for Microbiology
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Antibacterial Activity and Mechanism of Action of the Silver Ion in Staphylococcus aureus and Escherichia coli
Woo Kyung Jung, Hye Cheong Koo, Ki Woo Kim, Sook Shin, So Hyun Kim, Yong Ho Park
Applied and Environmental Microbiology Mar 2008, 74 (7) 2171-2178; DOI: 10.1128/AEM.02001-07

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Antibacterial Activity and Mechanism of Action of the Silver Ion in Staphylococcus aureus and Escherichia coli
Woo Kyung Jung, Hye Cheong Koo, Ki Woo Kim, Sook Shin, So Hyun Kim, Yong Ho Park
Applied and Environmental Microbiology Mar 2008, 74 (7) 2171-2178; DOI: 10.1128/AEM.02001-07
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KEYWORDS

Anti-Bacterial Agents
DNA, Bacterial
Escherichia coli
silver
Silver Nitrate
Staphylococcus aureus

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