Abstract
Stranded on the surface: The modulation of the amperometric feedback current in scanning electrochemical microscopy (SECM) through coulomb interactions between the phosphate groups of immobilized oligonucleotides and a freely diffusing, negatively charged redox mediator is used for imaging DNA spots (see picture) and establishing a simple and efficient label-free electrochemical detection of complementary hybridization on DNA microarrays.
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