Visible to the naked eye: An interplay between microscale electrophoresis and electrochemistry was exploited to simultaneously confine macromolecular encapsulants near an electrode surface while inflating them with gases evolved from the electrochemical reactions localized there. The compacted film can be seen under ordinary white light even when samples are unlabeled thus enabling a label-free technique for the detection of a variety of macromolecules including DNA, proteins, and cyclodextrans.
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