AC Electromagnetic Field Controls the Biofilms on the Glass Surface by Escherichia coli & Staphylococcus epidermidis Inhibition Effect

Author:

Aoyama Natsu1,Kanematsu Hideyuki2ORCID,Barry Dana M.3ORCID,Miura Hidekazu4,Ogawa Akiko5ORCID,Kogo Takeshi1ORCID,Kawai Risa1,Hagio Takeshi6ORCID,Hirai Nobumitsu5ORCID,Kato Takehito7ORCID,Yoshitake Michiko8,Ichino Ryoichi9

Affiliation:

1. Department of Materials Science and Engineering, National Institute of Technology (KOSEN), Suzuka College, (Currently Asahi Kasei Co.), Suzuka 510-0294, Japan

2. Research Collaboration Promotion Center, National Institute of Technology (KOSEN), Suzuka College, Suzuka 510-0294, Japan

3. Department of Electrical and Computer Engineering, Clarkson University, Potsdam, NY 13699, USA

4. Faculty of Medical Engineering, Suzuka University of Medical Science, Suzuka 510-0293, Japan

5. Department of Chemistry and Biochemistry, National Institute of Technology (KOSEN), Suzuka College, Suzuka 510-0294, Japan

6. Institutes of Innovation for Future Society, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan

7. National Institute of Technology (KOSEN), Oyama College, Oyama 323-0806, Japan

8. National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan

9. Graduate School of Engineering Chemical Systems Engineering 2, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan

Abstract

Biofilms, mainly comprised of bacteria, form on materials’ surfaces due to bacterial activity. They are generally composed of water, extracellular polymeric substances (polysaccharides, proteins, nucleic acids, and lipids), and bacteria. Some bacteria that form biofilms cause periodontal disease, corrosion of the metal materials that make up drains, and slippage. Inside of a biofilm is an environment conducive to the growth and propagation of bacteria. Problems with biofilms include the inability of disinfectants and antibiotics to act on them. Therefore, we have investigated the potential application of alternating electromagnetic fields for biofilm control. We obtained exciting results using various materials’ specimens and frequency conditions. Through these studies, we gradually understood that the combination of the type of bacteria, the kind of material, and the application of an electromagnetic field with various low frequencies (4 kHz–12 kHz) changes the circumstances of the onset of the biofilm suppression effect. In this study, relatively high frequencies (20 and 30 kHz) were applied to biofilms caused by Escherichia coli (E. coli) and Staphylococcus epidermidis (S. epidermidis), and quantitative evaluation was performed using staining methods. The sample surfaces were analyzed by Raman spectroscopy using a Laser Raman spectrometer to confirm the presence of biofilms on the surface.

Funder

Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science

Publisher

MDPI AG

Subject

General Materials Science

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