Date published: 2026-1-23

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Cyanine 5 Monofunctional MTSEA Dye, Potassium Salt (CAS 780025-89-0 free acid)

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Alternate Names:
2-[5-[1,3-Dihydro-3,3-dimethyl-1-[6-[[2-[(methylsulfonyl)thio]ethyl]amino]-6-oxohexyl]-5-sulfo-2H-indol-2-ylidene]-1,3-pentadienyl]-1-ethyl-3,3-dimethyl-5-sulfo-3H-indolium Inner Salt Potassium Salt
CAS Number:
780025-89-0 free acid
Molecular Weight:
832.13
Molecular Formula:
C36H46KN3O9S4
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Cyanine 5 Monofunctional MTSEA Dye, Potassium Salt is a water soluble, thiol-reactive fluorescent reagent. MTSEA stands for 2-aminoethyl methanethiosulfonate, a thiol-reactive agent. It is used to modify and label proteins containing free thiol groups. Overall, this product is widely employed in biological research to label and visualize biomolecules such as proteins, nucleic acids, and lipids. Salt forms of dyes, like Cyanine 5 Monofunctional MTSEA Dye, Potassium Salt, are more stable and easier to handle in laboratory applications.

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Cyanine 5 Monofunctional MTSEA Dye, Potassium Salt, 500 µg

sc-217975
500 µg
$317.00