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. Author manuscript; available in PMC: 2009 Dec 8.
Published in final edited form as: IEEE Trans Ind Appl. 1997;33(3):670–678. doi: 10.1109/28.585856

TABLE I.

Counts of MDA-231 Human Breast Cancer Cells in the Dielectric-Affinity Column Before and After Separation†

Target Ratio Measured starting Ratio Tumor cells on electrodes before Separation‡ Tumor cells on electrodes after Separation‡ Efficiency of purging tumor cells
1:3 1:2.9 N/A N/A >95%
1:103 1:1.1×103 N/A N/A >95%
1:104 1:1.2×104 98 94 96%
1:104 1:1.8×104 56 53 95%
1:105 1:0.9×105 3 3 100%
1:3×105 1:2.8×105 1 1 100%
†

: Applied voltage = 2 V rms at 50 kHz; eluate flow rate = 5 μL/min; suspension conductivity =10 mS/m.

‡

: The in-situ counting of tumor cells in the separation column was made for the tumor to normal cell ratio higher than 1:104. Below that, the counting involved too many cells and purging efficiencies were estimated by counting residual tumor cells that contaminated the “supposed” blood cell fraction.