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Cytiva Amersham™ Cy™3, Cy™ 5 Maleimide mono-Reactive Dye 5-packs

More selective method of antibody labeling that reduces the possibility of the label interfering with subsequent antibody-antigen reactions. Amersham™ Cy™3, Cy™ 5 Maleimide mono-Reactive Dye packs are packaged in premeasured amounts and foil-sealed to ensure consistent labelings.

Supplier:  Cytiva PA23031

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Catalog No. 45-001-273

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Cy3 and Cy5 mono-functional maleimides are particularly suitable for the selective labeling of molecules containing free sulfhydryl groups, such as cysteine residues in proteins and peptides, and oligonucleotides. They are also useful in antibody labeling since the dye molecules are introduced away from the antibody binding site, increasing the chance that functionality of the labeled molecule will be unimpaired. The protocol is simple and robust, offering an alternative chemistry when either greater selectivity of labeling is required or amine labeling with Cy3 and Cy5 NHS esters is not desirable or appropriate.

  • Provides an alternative for when CyDye™ NHS esters are unsuitable.
  • Dyes are packaged in premeasured amounts and foil-sealed to ensure consistent labelings

Order Info

Each kit contains five vials of dye, each sufficient for labeling 1mg of protein.



For the labelling of biological compounds with Cy3 monofunctional dye
Cy3 Maleimide Mono-Reactive Dye 5-Pack
Labeling 1mg Protein
Soluble in cold water and hot water
5 vials each sufficient to label 1 mg protein
Five vials of dye
2°C to 8°C, protected from light. Reconstituted material may be stored for up to 2 weeks at -20°C in aliquots to avoid repeat freeze thaw cycles.


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