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An innovative electrochemical sensor based on a combination of the elimination voltammetry and adsorptive stripping (AdS) techniques with a slightly soluble complex is presented. The test of our approach was aimed at analysis of aminopurines and oxopurines on carbon paste (CPE) and pencil graphite electrodes (PeGE). The voltammetric signals of purine derivatives are amplified: (i) by increasing the...
In electrochemical DNA hybridization assays target or probe DNAs end-labeled with electroactive compounds have been frequently used. We show that multiple osmium labels yielding faradaic (at carbon or mercury electrodes) and catalytic signals (at mercury electrodes) can be easily covalently bound to DNA molecules. We use (GAA) 7 (T) n oligodeoxynucleotides (ODNs) with n ranging between...
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