Cyanine3 maleimide

Cat. # Quantity Price Lead time
11080 1 mg $110.00 in stock
21080 5 mg $210.00 in stock
41080 25 mg $410.00 in stock
51080 50 mg $695.00 in stock
61080 100 mg $1190.00 in stock

Thiol mono-reactive Cyanine3 dye. This reagent can be used to attach Cyanine3 fluorophore (an analog of Cy3®) to proteins and peptides containing cysteine residues, as well as to other thiolated molecules (such as thiol-containing oligonucleotides).

Cystines should be reduced with TCEP (tris-carboxyethylphosphine) or other appropriate reductant prior to the labeling.

Labeling with Cyanine3 maleimide is selective, and efficient.

We recommend using water-soluble Sulfo-Cyanine3 maleimide for the labeling of antibodies and other sensitive proteins.

Cy3 absorbance and emission spectra

Cy3 absorbance and emission spectra

Customers also purchased with this product

AF568 NHS ester

AF568 derivative for labeling proteins and other high- and low-molecular weight ligands with free amines.

BDP 564/570 NHS ester

Lypohilic borodipyrromethene dye with orange emission for the labeling of primary and secondary amine groups.

Cyanine3 NHS ester

Amine-reactive Cyanine3 dye NHS ester.

General properties

Appearance: red powder
Molecular weight: 666.56
Molecular formula: C36H43N4O3BF4
Solubility: well soluble in DMSO (0.50 M = 330 g/L), in DMF, dichloromethane, very poorly soluble in water (0.57 mM = 420 mg/L)
Quality control: NMR 1H, HPLC-MS (95%)
Storage conditions: Storage: 24 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Avoid prolonged exposure to light. Desiccate.
MSDS: Download
Product specifications

Spectral properties

Excitation/absorption maximum, nm: 555
ε, L⋅mol−1⋅cm−1: 150000
Emission maximum, nm: 570
Fluorescence quantum yield: 0.31
CF260: 0.04
CF280: 0.09

Product citations

  1. Yang, M.; Zhang, L.; Sun, R.; Zhong, W.; Yang, Y.; Chen, C. Streptococcus pyogenes Cas9 displays biased one-dimensional diffusion on dsDNA to search for a target. bioRxiv, preprint. doi: 10.1101/754564
  2. Budiardjo, S.J.; Deay, J.J.; Calkins, A.L.; Wimalasena, V.K.; Montezano, D.; Biteen, J.S.; Slusky, J.S.G. Colicin E1 Fragments Potentiate Antibiotics by Plugging TolC. bioRxiv, preprint. doi: 10.1101/692251
  3. Mohale, M.; Gundampati, R.K.; Thallapuranam, S.; Heyes, C.D. Site-specific labeling and functional efficiencies of human fibroblast growth Factor-1 with a range of fluorescent dyes in the flexible N-Terminal region and a rigid β-turn region. Analytical Biochemistry, 2022, 640, 114524. doi: 10.1016/j.ab.2021.114524
  4. Bagert, J.D.; Mitchener, M.M.; Patriotis, A.L.; Dul, B.E.; Wojcik, F.; Nacev, B.A.; Feng, L.; Allis, C.D.; Muir, T.W. Oncohistone mutations enhance chromatin remodeling and alter cell fates. Nature Chemical Biology, 2021, 17(4), 403–411. doi: 10.1038/s41589-021-00738-1
Show more (28)
Your item has been added. View your cart or proceed to checkout
The count of items is incorrect.