Antibacterial Properties of Silicone Membranes after a Simple Two-Step Immersion Process in Iodine and Silver Nitrate Solutions
Autor: | Mikio Kikuchi, Jun Sawai, Miki Takeuchi, Yuka Nobuoka, Shiho Aoki, Risei Wada, Kenji Kubo, Junpei Takeshita, Kohei Yamakawa |
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Rok vydání: | 2018 |
Předmět: |
Staphylococcus aureus
Materials science Scanning electron microscope Silicones Metal Nanoparticles 02 engineering and technology 010402 general chemistry 01 natural sciences Applied Microbiology and Biotechnology chemistry.chemical_compound Silicone Tensile Strength Materials Testing Escherichia coli Humans Polydimethylsiloxane technology industry and agriculture Public Health Environmental and Occupational Health Silver iodide Food Packaging Silver Compounds Membranes Artificial Permeation Hydrogen-Ion Concentration Iodides 021001 nanoscience & nanotechnology 0104 chemical sciences Anti-Bacterial Agents stomatognathic diseases Silver nitrate Membrane chemistry Microscopy Electron Scanning Silver Nitrate 0210 nano-technology Antibacterial activity Nuclear chemistry Iodine |
Zdroj: | Biocontrol science. 23(3) |
ISSN: | 1884-0205 |
Popis: | Silicone is widely used in packing materials, medical equipment, and separation membranes. Since microbial cells easily adhere to the surface of silicone materials and form biofilms, techniques for incorporating antimicrobial activity into silicone materials are in high demand. This study describes the preparation of silver (Ag)/silicone composite membranes through a simple two-step immersion process, utilizing an iodine solution followed by a silver nitrate solution at room temperature. Scanning electron microscopy (SEM) observations revealed that particles with sizes of several nanometers to several tens of nanometers were present on the silicone membrane surface; these particles were identified as silver iodide using energy-dispersive X-ray spectroscopy (EDS) . The Ag/silicone membrane possessed excellent antibacterial efficacy against Escherichia coli and Staphylococcus aureus, and the antibacterial efficacy (R) against both types of bacteria was R > 4, even after stomacher treatment or acidic treatment of pH 2-6 for 24 h. The mechanical strength of the silicone membrane was also maintained after antibacterial treatment, with Young's modulus values of 7.9±1.2 MPa and 8.3±1.5 MPa for the untreated membrane and Ag/silicone membrane, respectively (p > 0.05) . In addition, the reduction in permeation performance of the Ag/silicone membrane was only 20%, despite the antibacterial treatment on the membrane surface. This antibacterial treatment method of silicone membranes can be conducted at room temperature (25℃) without special equipment, and may be applied to other types of silicone materials. |
Databáze: | OpenAIRE |
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