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  • D8417 - 4′,6-Diamidino-2-phenylindole dihydrochloride

D8417 Sigma-Aldrich

4′,6-Diamidino-2-phenylindole dihydrochloride

powder, BioReagent, suitable for cell culture, ≥98% (HPLC and TLC), suitable for fluorescence

Synonym: 2-(4-Amidinophenyl)-6-indolecarbamidine dihydrochloride, DAPI dihydrochloride

  • CAS Number 28718-90-3

  • Empirical Formula (Hill Notation) C16H15N5 · 2HCl

  • Molecular Weight 350.25

  •  Beilstein/REAXYS Number 4894417

  •  EC Number 249-186-7

  •  MDL number MFCD00012681

  •  PubChem Substance ID 24894213



Related Categories In Vivo/In Vitro Tracking of Stem Cells, Apoptosis Detection, Apoptosis and Cell Cycle, Cell Biology, Cell Culture,
product line   BioReagent
assay   ≥98% (HPLC and TLC)
form   powder
solubility   H2O: 20 mg/mL (Heat or sonication may be required. Solutions stored in the dark at room temperature or 4 °C should be stable for 2 to 3 weeks.)
  PBS: insoluble
fluorescence   λex 340 nm; λem 488 nm (nur DAPI)
  λex 364 nm; λem 454 nm (DAPI-DNA-Komplex)
suitability   suitable for cell culture
  suitable for fluorescence
storage temp.   2-8°C


General description

4′,6-Diamidino-2-phenylindole dihydrochloride is a fluorescent dye for staining DNA. It strongly interacts with the dAT-rich (deoxy adenine-thymine) regions of the DNA.


4′,6-Diamidino-2-phenylindole dihydrochloride has been used in staining of various cells in immunocytochemistry and cytochemistry, human subcutaneous adipose tissues for fluorescence imaging, embryo sections for immunofluorescence.

DAPI is several times more sensitive than ethidium bromide for staining DNA in agarose gels. It may be used for photofootprinting of DNA, to detect annealed probes in blotting applications by specifically visualizing the double-stranded complex, and to study the changes in DNA and analyze DNA content during apoptosis using flow cytometry. DAPI staining has also been shown to be a sensitive and specific detection method for mycoplasma.


1, 5, 10 mg in glass bottle

Biochem/physiol Actions

Cell permeable fluorescent minor groove-binding probe for DNA. Binds to the minor groove of double-stranded DNA (preferentially to AT rich DNA), forming a stable complex which fluoresces approximately 20 times greater than DAPI alone.


Protect from light.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 

Single- & multi-channel pipettes from BRAND

Pipette Controller from Brand
Protocols & Articles


Mycoplasma Detection/Elimination

The maintenance of contamination-free cell lines is essential to cell-based research. Among the biggest concerns are mycoplasma contamination. Although mycoplasma do not usually kill contaminated cel...
Don Finley
BioFiles v7 n1, 2011, 14–15
Keywords: Eliminations, Metabolism, Polymerase chain reaction

Related Content

Cell Culture Troubleshooting Guide

Cell culture has become one of the most fundamental techniques for modeling biological systems, and is of increasing importance in the biotechnology and pharmaceutical sectors as well as an essential...
Keywords: Antibiotics, Apoptosis, Cell attachment, Cell culture, Cryopreservation, Filtration, Growth factors, Pharmaceutical, Phase transitions

Peer-Reviewed Papers


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