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Development of rapid oral bacteria detection apparatus based on dielectrophoretic impedance measurement method

Development of rapid oral bacteria detection apparatus based on dielectrophoretic impedance measurement method

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  • Author(s): R. Hamada 1, 2 ; J. Suehiro 2 ; M. Nakano 2 ; T. Kikutani 3 ; K. Konishi 4
    • View affiliations
    • Affiliations: 1: R&D Center, Panasonic Healthcare Co., Ltd., Toon, Japan
      2: Department of Electrical and Electronic Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka, Japan
      3: Division of Clinical Oral Rehabilitation, Graduate School of Life Dentistry, Nippon Dental University School of Life Dentistry, Tokyo, Japan
      4: Department of Microbiology, Nippon Dental University School of Life Dentistry at Tokyo, Tokyo, Japan
  • Source: Volume 5, Issue 2, June 2011, p. 25 – 31
    DOI:  10.1049/iet-nbt.2010.0011 , Print ISSN 1751-8741, Online ISSN 1751-875X
© The Institution of Engineering and Technology
Published

In this study, a bacteria detection apparatus based on dielectrophoretic impedance measurement (DEPIM) method was demonstrated for rapid evaluation of oral hygiene. The authors integrated a micro electrode chip on which bacteria were captured by dielectrophoresis (DEP), an AC voltage source to induce DEP force, and an impedance measurement circuit to a portable instrument that enables rapid and automated oral bacterial inspection in hospitals and clinics. Special considerations have been made on effects of high electrical conductivity of oral samples on DEP force and DEPIM results. It was shown experimentally and theoretically that using a higher electric field frequency for the DEP bacteria trap and the impedance measurement could realise DEPIM application to bacteria inspection from oral samples with higher conductivity. Based on these investigations, the authors optimised the frequency condition of the DEPIM suitable for inspecting an oral sample along with the design and development of a portable DEPIM apparatus for on-site inspection of oral bacteria. Under the optimised frequency condition, DEPIM results were in good agreement with the conventional culture method showing significant applicability of the DEPIM apparatus for practical rapid oral bacteria inspection.

Inspec keywords: microelectrodes; biomedical electrodes; hygiene; microorganisms; biomedical measurement; bioelectric phenomena; electric impedance measurement; electrophoresis; biomedical equipment

Other keywords: rapid oral bacteria detection apparatus; dielectrophoresis; dielectrophoretic impedance measurement method; conventional culture method; microelectrode chip; oral hygiene; high electrical conductivity; AC voltage source; oral bacterial inspection; DEPIM

Subjects: Electrical instruments and techniques; Impedance and admittance measurement; Electric and magnetic fields (medical uses); Electrodiagnostics and other electrical measurement techniques; Bioelectric signals

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