One-Dimensional Flow of Bacteria on an Electrode Rail by Dielectrophoresis: Toward Single-Cell-Based Analysis

被引:4
作者
Yamaguchi, Yukihiro [1 ]
Yamamoto, Takatoki [1 ]
机构
[1] Tokyo Inst Technol, Sch Engn, Dept Mech Engn, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528550, Japan
基金
日本学术振兴会;
关键词
dielectrophoresis; microfluidics; single cell; single bacterium; flow cytometer;
D O I
10.3390/mi12020123
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Many applications in biotechnology and medicine, among other disciplines, require the rapid enumeration of bacteria, preferably using miniaturized portable devices. Microfluidic technology is expected to solve this miniaturization issue. In the enumeration of bacteria in microfluidic devices, the technique of aligning bacteria in a single line prior to counting is the key to an accurate count at single-bacterium resolution. Here, we describe the numerical and experimental evaluation of a device utilizing a dielectrophoretic force to array bacteria in a single line, allowing their facile numeration. The device comprises a channel to flow bacteria, two counter electrodes, and a capture electrode several microns or less in width for arranging bacteria in a single line. When the capture electrode is narrower than the diameter of a bacterium, the entrapment efficiency of the one-dimensional array is 80% or more within 2 s. Furthermore, since some cell-sorting applications require bacteria to move against the liquid flow, we demonstrated that bacteria can move in a single line in the off-axial direction tilted 30 degrees from the flow direction. Our findings provide the basis for designing miniature, portable devices for evaluating bacteria with single-cell accuracy.
引用
收藏
页码:1 / 13
页数:13
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