Abstract: lication of a rapid time correlated single photon counting (TCSPC) apparatus on the investigation of fluorescent labelled DNA is presented. It could be shown that the investigated dye coumarin 120 can be used as a marker for a one dye-one lane electrophoresis-concept in DNA sequencing. This is possible because of the interaction between the dye and the four different DNA bases, which is based on a photoinduced electron transfer. A distinguishing of the bases is possible because of the different decay times. A fluorescein derivative also showed excellent fluorescence after labelling. It can be used as a marker for common electrophoresis-concepts, but the interaction was too weak for a secure base distinguishing a one dye-one lane. Now further investigations are under way to find new labeling positions resulting in stronger interactions. Additionally, we are looking for dyes in the red spectral range to improve the sensitivity of detection. !11
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