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Updated: Jun 8, 2026
Antimicrobial Characterization of Advanced Materials for Bioengineering Applications
Published on: August 4, 2018
Antibacterial properties of nine pure metals: a laboratory study using Staphylococcus aureus and Escherichia coli
Miyano Yasuyuki1, Koyama Kunihiro, Sreekumari Kurissery
1Faculty of Education and Graduate Studies, Akita University, Akita City, Japan.
Abstract:
Bacterial attachment and growth on material surfaces are considered to be the primary steps leading to the formation of biofilm. Biofilms in hospital and food processing settings can result in bacterial infection and food contamination, respectively. Prevention of bacterial attachment, therefore, is considered to be the best strategy for abating these menaces and therefore the development of antibacterial metals becomes important. In this study, nine pure metals, viz. titanium, cobalt, nickel, copper, zinc, zirconium, molybdenum, tin, and lead have been tested for their antibacterial properties against two bacterial strains, Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli. This was accomplished using two assay methods, the film contact method and the shaking flask method. The results show that the antibacterial properties varied significantly with different metals and the effectiveness of metals to resist bacterial attachment varied with the bacterial strain. Among the metals tested, titanium and tin did not exhibit antibacterial properties. TEM images showed that metal accumulation resulted in the disruption of the bacterial cell wall and other cellular components.
Insights
This study tested nine metals for antibacterial properties against Staphylococcus aureus and Escherichia coli. Copper and zinc showed significant antibacterial effects, inhibiting bacterial attachment and disrupting cell walls.
Area of Science:
- Materials Science
- Microbiology
- Biotechnology
Background:
- Bacterial biofilms on surfaces cause hospital infections and food contamination.
- Preventing bacterial attachment is key to controlling biofilms.
- Developing antibacterial materials is crucial for public health and safety.
Purpose of the Study:
- To evaluate the antibacterial properties of nine pure metals against Staphylococcus aureus and Escherichia coli.
- To determine the effectiveness of different metals in preventing bacterial attachment.
- To understand the mechanism of bacterial cell disruption by metal accumulation.
Main Methods:
- Tested nine pure metals: titanium, cobalt, nickel, copper, zinc, zirconium, molybdenum, tin, and lead.
- Used two methods: film contact and shaking flask assays.
- Examined bacterial strains: Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli.
- Utilized Transmission Electron Microscopy (TEM) to observe cellular changes.
Main Results:
- Antibacterial efficacy varied significantly among the tested metals.
- Copper and zinc demonstrated notable antibacterial properties.
- Titanium and tin showed no significant antibacterial activity.
- Metal accumulation led to bacterial cell wall and component disruption, observed via TEM.
Conclusions:
- Metal selection is critical for effective antibacterial surface development.
- Copper and zinc are promising candidates for antibacterial applications.
- Further research can leverage these findings to design materials that prevent biofilm formation.
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