YO-TAP-3, red fluorescent nucleic acid stain

Cat. # Quantity Price Lead time
A2710 50 uL, 5 mM/DMSO $90 in stock
22710 200 uL, 5 mM/DMSO $350 in stock
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YO-TAP-3 (Oxazole Red Monomer, also known as YO-PRO®-3) is a red fluorescent carbocyanine monomeric dye. YO-TAP-3 is a cell-impermeant nucleic acid stain that is nonfluorescent in the absence of nucleic acids but exhibits significant fluorescence enhancement upon binding to DNA.

The bright fluorescence signal and low background make YO-TAP-3 ideal for staining nucleic acids on microarrays, as well as for nuclear and chromosome counterstaining in multicolor fluorescence labeling experiments.

Simultaneous labeling with cell-impermeant YO-TAP-3 and cell-permeable LUCS 13 or Annexin V-AF488 can be used to assess cell viability and apoptosis.

Absorption and emission spectra of YO-TAP-3 (DNA–dye complex)

Absorption and emission spectra of YO-TAP-3 (DNA–dye complex)

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General properties

Appearance: blue solution
Molecular weight: 655.36
CAS number: 157199-62-7
Molecular formula: C26H31I2N3O
IUPAC name: trimethyl-[3-[4-[(Z,3Z)-3-(3-methyl-1,3-benzoxazol-2-ylidene)prop-1-enyl]quinolin-1-ium-1-yl]propyl]azanium;diiodide
Quality control: NMR 1H and HPLC-MS (95+%)
Storage conditions: 24 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Desiccate.
MSDS: Download
Product specifications

Spectral properties

Excitation/absorption maximum, nm: 611
Emission maximum, nm: 629
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