کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7150063 | 1462117 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pretreatment of cell membranes for improved electropermeabilization-assisted dielectrophoretic impedance measurement
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
We improved our previously reported highly sensitive bacteria detection method called electropermeabilization-assisted dielectrophoretic impedance measurement (EPA-DEPIM), which counts the number of bacteria by measuring changes in impedance. EPA-DEPIM involves two processes: collection of bacteria by dielectrophoresis (DEP), followed by electropermeabilization (EP) of the cell membranes. In DEP, bacterial cells in aqueous solution are collected on microelectrodes by the dielectrophoretic force. In EP, a pulse-like rectangular wave is applied to the collected cells to disrupt their membranes. This increases the signal sensitivity because the disrupted membranes release intracellular ions that increase the change in impedance. However, the pulse-like EP wave creates a strong electric field that causes metal ions to be released from the microelectrodes, increasing the blank signal to levels comparable to that for a low-concentration Escherichia coli suspension (102Â cells/ml). To address this problem, we demonstrated the efficacy of two types of pretreatment applied before the EP wave: chemical pretreatment by exposure to hydrogen peroxide, and physical pretreatment by a small pulse-like voltage. Both pretreatments successfully intensified the change in impedance even at a lower EP voltage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 173, October 2012, Pages 676-681
Journal: Sensors and Actuators B: Chemical - Volume 173, October 2012, Pages 676-681
نویسندگان
Michihiko Nakano, Ryo Hamada, Hiroyuki Takayama, Yasuhiko Shonishi, Takafumi Hisajima, Lina Mao, Junya Suehiro,