Cyanine5 maleimide

Cat. # Quantity Price Lead time
13080 1 mg $110.00 in stock
23080 5 mg $210.00 in stock
43080 25 mg $410.00 in stock
53080 50 mg $695.00 in stock
63080 100 mg $1190.00 in stock

Cyanine5 maleimide is a mono-reactive dye which selectively couples with thiol groups (for example, with cysteines in peptides and proteins) to give labeled conjugates.

Cyanine5 is an analog of Cy5®, a common fluorophore which is compatible with various instrumentation like microscopes, imagers, and fluorescence readers.

For the labeling of antibodies and sensitive proteins we recommend to use the water soluble sulfo-Cyanine5 maleimide.

Cy5 excitation and emission spectra

Cy5 excitation and emission spectra

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General properties

Appearance: dark blue powder
Molecular weight: 641.24
CAS number: 1437872-46-2 (without anion), 1437796-65-0 (chloride)
Molecular formula: C38H45ClN4O3
IUPAC name: 3H-​Indolium, 2-​[5-​[1-​[6-​[[2-​(2,​5-​dihydro-​2,​5-​dioxo-​1H-​pyrrol-​1-​yl)​ethyl]​amino]​-​6-​oxohexyl]​-​1,​3-​dihydro-​3,​3-​dimethyl-​2H-​indol-​2-​ylidene]​-​1,​3-​pentadien-​1-​yl]​-​1,​3,​3-​trimethyl-
Solubility: soluble in organic solvents (DMF, DMSO, dichloromethane), practically insoluble in water (31 uM, 23 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: 646
ε, L⋅mol−1⋅cm−1: 250000
Emission maximum, nm: 662
Fluorescence quantum yield: 0.2
CF260: 0.03
CF280: 0.04

Product citations

  1. Pishesha, N.; Harmand, T.; Smeding, L.; Ma, W.; Ludwig, L.; Janssen, R.; Islam, A.; Xie, Y.; Fang, T.; McCaul, N.; Pinney, W.; Sugito, H.; Ploegh, H. Single domain antibody-antigen adducts that target Class II MHC induce antigen-specific tolerance. Research Square, preprint. doi: 10.21203/rs.3.rs-192181/v1
  2. Delvaux, N.A.; Mathew, B.; Rice, K.G. Fluorescent Labeling of Plasmid DNA for Gene Delivery: Implications of Dye Hydrophobicity on Labeling Efficiencies and Nanoparticle Size. Analytical Biochemistry, in press. doi: 10.1016/j.ab.2020.113895
  3. 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
  4. Ast, J.; Arvaniti, A.; Fine, N.H.F.; Nasteska, D.; Ashford, F.B.; Stamataki, Z.M Koszegi, Z.; Bacon, A.; Trapp, S.; Jones, B.J.; Hastoy, B.; Tomas, A.; Reissaus, C.; Linnemann, A.K.; D'Este, E.; Calebiro, D.; Johnsson, K.; Podewin, T.; Broichhagen, J.; Hodson, D.J. LUXendins reveal endogenous glucagon-like peptide-1 receptor distribution and dynamics. bioRxiv, preprint. doi: 10.1101/557132
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