Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 394, Issue 3, Pages 801-809Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-009-2743-7
Keywords
Dielectrophoresis; Cell separation; Microfluidics; Cancer; Malignant cells
Funding
- Ministry of Science and Technology through Bio Tool R&D Project for Cell Research
- internal research fund in Sogang University [200810027]
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In this paper, we successfully separated malignant human breast cancer epithelial cells (MCF 7) from healthy breast cells (MCF 10A) and analyzed the main parameters that influence the separation efficiency with an advanced dielectrophoresis (DEP)-activated cell sorter (DACS). Using the efficient DACS, the malignant cancer cells (MCF 7) were isolated successfully by noninvasive methods from normal cells with similar cell size distributions (MCF 10A), depending on differences between their material properties such as conductivity and permittivity, because our system was able to discern the subtle differences in the properties by generating continuously changed electrical field gradients. In order to evaluate the separation performance without considering size variations, the cells collected from each outlet were divided into size-dependent groups and counted statistically. Following that, the quantitative relative ratio of numbers between MCF 7 and MCF 10A cells in each size-dependent group separated by the DEP were compared according to applied frequencies in the range 48, 51, and 53 MHz with an applied amplitude of 8 V-pp. Finally, under the applied voltage of 48 MHz-8 V-pp and a flow rate of 290 mu m/s, MCF 7 and MCF 10A cells were separated with a maximum efficiency of 86.67% and 98.73% respectively. Therefore, our suggested system shows it can be used for detection and separation of cancerous epithelial cells from noncancerous cells in clinical applications.
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