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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General properties

Appearance: dark red crystals
Molecular weight: 751.91
CAS number: 1424150-38-8 (sodium salt); 1424433-17-9, 1518643-34-9 (inner salt)
Molecular formula: C34H38N3KO10S2
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. Barnett, D.; Hall, J.; Haab, B. Automated identification and quantification of signals in multichannel immunofluorescence images: the SignalFinder platform. The American Journal of Pathology, in press. doi: 10.1016/j.ajpath.2019.03.011
  2. Umakoshi, T.; Fukuda, S.; Iino, R.; Uchihashi, T.; Ando, T. High-speed near-field fluorescence microscopy combined with high-speed atomic force microscopy for biological studies. Biochimica et Biophysica Acta, in press. doi: 10.1016/j.bbagen.2019.03.011
  3. 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
  4. 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
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