A rapid bacteria detection technique utilizing impedance measurement combined with positive and negative dielectrophoresis

R. Hamada, H. Takayama, Y. Shonishi, L. Mao, Michihiko Nakano, Junya Suehiro

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

In this study, a bacterial detection technique and device that utilizes advantages of both positive and negative dielectrophoresis (DEP) has been proposed and demonstrated. The device has two microelectrodes, which serve as a bacteria concentrator using negative DEP (n-DEP) and as a bacteria detector using positive DEP (p-DEP), respectively. Bacteria flowing into the device are repelled under action of n-DEP force exerted by the first microelectrode, and are pushed toward the second microelectrode situated at the downstream. Then concentrated bacteria are finally captured by p-DEP on the second microelectrode and detected by dielectrophoretic impedance measurement (DEPIM) method. The numerical simulations and experiments proved that n-DEP concentrator could make DEPIM sensitivity two times higher than that without n-DEP as a result of increased number of bacteria trapped on the p-DEP microelectrode.

Original languageEnglish
Pages (from-to)439-445
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume181
DOIs
Publication statusPublished - Mar 25 2013

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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