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SYTO 21 Green Nucleic Acid Stain


SYTO 21 Green Nucleic Acid Stain is a cell-permeant nucleic acid stain that shows a large fluorescence enhancement upon binding nucleic acids. The SYTO 21 dye can be used to stain RNA and DNA in both live and dead eukaryotic cells, as well as in Gram-positive and Gram-negative bacteria. Eukaryotic cells incubated with SYTO 21 dye generally show cytoplasmic or mitochondrial staining, as well as nuclear staining. This dye is provided as 5 mM solution in DMSO.


  • Permeability to virtually all cell membranes, including mammalian cells and bacteria.
  • High molar absorptivity, with extinction coefficients >50,000 cm-1 M-1 at visible absorption maxima.
  • Extremely low intrinsic fluorescence, with quantum yields typically <0.01 when not bound to nucleic acids.
  • Quantum yields that are typically >0.4 when bound to nucleic acids.


Excitation/Emission: DNA 494/517 nm
Shipping Condition: Ambient
Storage Conditions: -20ºC, protect from light
Molecular Formula: C30H33ClN4S
Molecular Weight: 517.13
Concentration: 5 mM in DMSO


To Order

Buy Cat.No. Product name Ex/Em(nm) Size Price
C084 SYTO 21 Green Nucleic Acid Stain 494/517 nm 250 µL $180 



Protocol (PDF): C084
COA (PDF):  C084