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The performances of a classical interdigitated metal electrode\u2010based dielectrophoresis microfluidic device and this enhanced version, that includes insulator\u2010based pole structures, were compared using the same setup. <jats:italic>Escherichia coli<\/jats:italic> samples were concentrated at several continuous flows and the device's trapping efficiencies were evaluated by exhaustive cell counts. Our results show that pole structures enhance the retention up to 12.6%, obtaining significant differences for flow rates up to 20 \u03bcL\/min, when compared to an equivalent classical interdigitated electrodes setup. In addition, we performed a subsequent proteomic analysis to evaluate the viability of the biological samples after the long exposure to the actuating electrical field. 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