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

作者：Hamada R^*; Takayama H; Shonishi Y; Mao L; Nakano M; Suehiro J

来源：Sensors and Actuators B: Chemical , 2013, 181: 439-445.

DOI：10.1016/j.snb.2013.02.030

• Dielectrophoresis
• Impedance measurement
• Bacteria detection
• Trajectory

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.

• 出版日期2013-5