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The direct electrochemical detection of synthetic DNA and native 16S rRNA fragments isolated from Escherichia coli is described. Oligonucleotides are detected via selective post-labeling of double stranded DNA and DNA–RNA duplexes with a biotinylated intercalator that enables high-specific binding of a streptavidin/alkaline phosphatase conjugate. The alkaline phosphatase catalyzes formation of p-aminophenol...
For increasing the sensitivity of label-free DNA assays an amplification strategy is proposed based on the synthesis of a proflavine derivative which on the one hand retains its high affinity for double-stranded DNA (dsDNA) intercalation and on the other hand is functionalized via a flexible spacer with biotin moieties. By this, subsequent to the post-labeling of areas with dsDNA, reporter systems...
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