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Electrocatalytic activity of DNA on electrodes as an indication of hybridisation

Zhi, Zheng-liang ; Drazan, Viktor ; Wolfbeis, Otto S. ; Mirsky, Vladimir M.


Electron transfer between metal electrodes and ferro/ferricyanide is completely suppressed at low ionic concentration. We describe here a new phenomenon related to this reaction: an immobilisation of thiolated single-stranded DNA on gold electrodes retains this activity at low ionic strength up to the level corresponding to the high ionic strength. In contrast, a hybridisation of the ...


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