We enable nucleic acid labeling bioconjugation
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Eterneon²550 Azide (Cy3TM alternative)

Ultra sensitive Fluorescent Dye to label DNA/RNA

  • Size
  • Catalog No.
  • Price
  • 1.0 mg
  • BCFA-220-1

  • 210 €
  • This special yellow-emitting fluorescent dye exhibits advanced click reaction kinetics. Therefore, also less amount of copper can be used in the reaction mixture without any effect on the great reaction efficiency. This effect can be crucial e.g. when copper sensitive enzyme or biomolecules shall be labeled. Once attached to a biomolecule fluorescence microscopy detection can be carried out just like with Cy3, or any other alternative dye.


    H. Jiang et al, Bioconjugate Chem., 2014, 25, 698-706

    C. Uttamapinant, et al., Angew. Chem. Int. Ed., 2012, 51, 5852-56

    A. Geabler et al., J- Lipid. Res., 2016, 57, 1934-47


    • What are the Eterneon dyes?

      Our EterneonTM dyes are a special class of ultra-stable fluorescent dyes. Our long stokes-shift ones even have well separated peaks of absorbance and emission, so it is very convenient to characterize your sample with very sharp and strongly fluorescent signals. These special dyes are oligothiophene based, uncharged and not pH sensitive.

    • Molecular Formula


    • Shelf Life

      12 months unopened after receipt

    • Storage Conditions

      -20 °C, dark

    • Molecular Weight

      927.1 g/mol

    • Purity

      ≥ 90 % (HPLC)

    • Physical State

      red solid

    • CAS Number


    • Additional name

      Cy3TM alternative; Alexa Fluor 555 alternative; CF Dye 555 alternative; DyLight 555 alternative

    • Absorption (max)

      PBS; pH 7.5: 550 nm

    • Emission (max)

      PBS, pH 7.5: 570 nm

    • Ɛ (max)

      PBS, pH 7.5: 150,000 cm-1M-1

    • Solubility

      DMSO, DMF, MeOH

    • Preparation/Handling

      For a 10 mM solution add 107 μL to 1 mg.