The development of a sensitive, non-isotopic filter hybridization method based on the peroxidase catalyzed luminol reaction is described. High sensitivity was achieved by optimizing the conditions of the hybridization procedure, the immunochemical detection and the peroxidase/luminol reaction. This resulted in the reproducible detection of 10-30 femtogram of target DNA on blots within minutes when a cooled charge coupled device (CCD) camera was used to record the luminescence signal. After optimalization, the system was successfully applied for the qualitative and quantitative analysis of small amounts of DNA in dot-blots as well as in Southern blot analysis.
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