Sulfo-Cyanine3 NHS ester

Cat. # Quantity Price Lead time
11320 1 mg $110.00 in stock
21320 5 mg $290.00 in stock
41320 25 mg $690.00 in stock
51320 50 mg $1270.00 in stock
61320 100 mg $1990.00 in stock

Water soluble, amino-reactive sulfo-Cyanine3 NHS ester. Efficiently labels proteins and peptides in purely aqueous solution, without need for organic co-solvent. Ideal for proteins with low solubility, and proteins prone to denaturation.

This is sulfonated, hydrophilic and water-soluble dye. Non-sulfonated Cyanine3 NHS ester is also available.

This product is an analog of Cy3® NHS ester. Sulfo-Cyanine3 NHS ester replaces Cy3®, Alexa Fluor 546, and DyLight 549 for all applications.

Sulfo-Cyanine3 absorbance and emission spectra

Sulfo-Cyanine3 absorbance and emission spectra

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Alkyne maleimide

Maleimide reagent for the attachment of alkyne functional group to proteins, peptides, and other molecules bearing SH (thiol) groups, including cysteine residues.

Cyanine3 amine

Cyanine3 is an fluorophore with free amino group (amino-dye). It can be conjugated with NHS esters, carboxy groups (after activation), and epoxides.

General properties

Appearance: dark red crystals
Molecular weight: 735.80
CAS number: 1424150-38-8 (sodium salt); 1424433-17-9, 1518643-34-9 (inner salt)
Molecular formula: C34H38N3NaO10S2
IUPAC name: 3H-​Indolium, 2-​[3-​(1,​3-​dihydro-​1,​3,​3-​trimethyl-​5-​sulfo-​2H-​indol-​2-​ylidene)​-​1-​propen-​1-​yl]​-​1-​[6-​[(2,​5-​dioxo-​1-​pyrrolidinyl)​oxy]​-​6-​oxohexyl]​-​3,​3-​dimethyl-​5-​sulfo-​, inner salt, sodium salt
Solubility: very high in water, good in polar organic solvents (DMF, DMSO)
Quality control: NMR 1H, HPLC-MS (95%)
Storage conditions: Storage: 12 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 maximum, nm: 548
ε, L⋅mol−1⋅cm−1: 162000
Emission maximum, nm: 563
Fluorescence quantum yield: 0.1
CF260: 0.03
CF280: 0.06

Product citations

  1. Kam, A.; Loo, S.; Dutta, B.; Sze, S.K.; Tam, J.P. Plant-derived mitochondria-targeting cysteine-rich peptide modulates cellular bioenergetics. Journal of Biological Chemistry, 2019, 294(11), 4000–4011. doi: 10.1074/jbc.RA118.006693
  2. Cao, P.; Wei, X.; Awal, R.P.; Müller, R.; Wall, D. A Highly Polymorphic Receptor Governs Many Distinct Self-Recognition Types within the Myxococcales Order. mBio, 2019, 10, e02751-18. doi: 10.1128/mBio.02751-18
  3. Meena, G.G.; Jain, A.; Parks, J.; Stambaugh, A.; Patterson, J.; Hawkins, A.; Schmidt, H. Integration of sample preparation and analysis on an optofluidic chip for multi-target disease detection. Lab on a Chip, 2018, 18(23), 3678–3686. doi: 10.1039/c8lc00966j
  4. Zadeh, P.S.N.; do Valle Gomes, M.Z.; Abrahamsson, M.; Palmqvist, A.; Åkerman, B. Measuring Viscosity inside Mesoporous Silica Using Protein-Bound Molecular Rotor Probe. Physical Chemistry Chemical Physics, 2018, 20(36), 23202–23213. doi: 10.1039/C8CP01063C
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