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Thiazole Orange, 10 mM in DMSO

Thiazole orange (TO) is commonly used in reticulocyte analysis to stain residual RNA of blood cells, to stain DNA in agarose gels and capillary electrophoresis. Thiazole Orange stains the yeast nucleus, and is also able to stain bacteria and mammalian cells.

Product Attributes

Probe cellular localization

Nucleus & cytoplasm

For live or fixed cells

For live/intact cells

Assay type/options

No-wash staining

Cell permeability

Membrane permeant




512/533 nm (with DNA)

Note: Due to operating restrictions related to our COVID-19 response, primary antibody conjugates of R-PE, APC, PerCP, HRP, or AP are temporarily unavailable. All other antibody options are still available. We apologize for the inconvenience. Please see our easy-to-use Mix-n-Stain™ Antibody Labeling Kits for labeling antibodies with R-PE, APC, tandem dyes, and enzymes.
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1 mL
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Supporting Documents

Product Description

Thiazole orange (TO) is commonly used in reticulocyte analysis to stain residual RNA of blood cells1, to stain DNA in agarose gels2 and capillary electrophoresis3.

In live yeast, TO is concentrated in the nucleus, but after fixation the staining becomes cytoplasmic. In live mammalian cells, thiazole orange initially stains mitochondria and then redistributes to the nucleus and cytoplasm. Thiazole orange can also stain live bacteria (gram-positive and gram-negative). See our Cellular Stains Table for more information on how our dyes stain various organisms.

Product Features:

  • λExEm (with DNA) = 512/533 nm
  • Supplied at 10 mM in DMSO
  • Store at 4°C and protect from light


1.  Cytometry 7, 508-517 (1986).
2. Nucleic Acids Res. 19, 327-333 (1990).
3. Chem. 66, 1941-1948 (1994).


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