Phototope®-Star Detection Kit 

  • Catalog # N7020 was discontinued on April 16, 2013
  • Product Information
    Phototope® Detection is based on chemiluminescence, an enzyme-catalyzed reaction which emits a blue light. This detection method is replacing radioactive detection due to sensitivity, convenience, safety and cost.
    In the Phototope Detection Kits for nucleic acids, biotin associated with the target DNA provides the handle for the chemiluminescent detection. Biotinylated DNA is detected on a membrane support by first exposing the membrane to streptavidin, which binds to the biotinylated DNA. Next, biotinylated alkaline phosphatase complex is added, which binds to the streptavidin, resulting in the creation of a conjugate between the alkaline phosphatase and the DNA on the membrane. In the final step, the CDP-Star™ reagent is added. Alkaline phosphatase catalyzes the removal of the phosphate from the CDP-Star® (phenylphosphate substituted 1,2 dioxetane) to yield a moderately stable intermediate which then spontaneously decays, emitting light at 461 nm. The emitted light is detected by exposing the membrane to X-ray film for 1 to 10 minutes.

    The biotin handle can be associated with your target DNA either directly (covalently) or by hybridization. Biotin can be incorporated directly into DNA by using enzymatic polymerization of DNA with a biotinylated primer (for DNA sequencing) or by polymerization in the presence of biotinylated nucleotide triphosphates (as with the NEBlot® Phototope® System).

    Overview of chemiluminescent detection
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