Cyanine5 NHS ester

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13020 1 mg 110.00$ in stock
23020 5 mg 210.00$ in stock
43020 25 mg 410.00$ in stock
53020 50 mg 695.00$ in stock
63020 100 mg 1190.00$ in stock

During last years, Cyanine5 flurophore (analog of Cy5®) has become an incredibly popular label in life science research and diagnostics. Fluorophore emission has maximum in red region, where many CCD detectors have maximum sensitivity, and biological objects have low background. Dye color is very intense, therefore quantity as small as 1 nanomol can be detected in gel electrophoresis by naked eye.

This Cyanine5 NHS ester (analog to Cy5® NHS ester) is a reactive dye for the labeling of amino-groups in peptides, proteins, and oligonucleotides. This dye requires small amount of organic co-solvent (such as DMF or DMSO) to be used in labeling reaction (please see our recommended protocol for more details). This reagent is ideal for very cost-efficient labeling of soluble proteins, as well as all kinds of peptides and oligonucleotides. This reagent also works well in organic solvents for small molecule labeling. For more sophisticated targets such as easily degradable proteins, when use of DMF or DMSO is undesirable, consider using water-soluble sulfo-Cyanine 5 NHS ester which does not require co-solvent, and has very similar fluorescent properties.

Cyanine5 fluorophore is compatible with various instrumentation including many fluorescent microscopes, imagers, scanners, and fluorescence readers. A number of various Cyanine5 analogs exist - Cyanine5 NHS ester can replace activated esters of Cy5®, Alexa Fluor 647, and DyLight 649.

Cy5 excitation and emission spectra

General properties

Appearance: dark blue powder
Molecular weight: 616.19
Molecular formula: C36H42ClN3O4
CAS number: 1032678-42-4, 350686-88-3
Solubility: good in polar (DMSO, DMF) and chlorinated (DCM, chlroform) organic solvents, low solubility in water
Quality control: NMR 1H (95%) and 13C, TLC, functional testing
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

Spectral properties

Excitation maximum, nm: 646
Extinction coefficient at excitation maximum, Lmol-1cm-1: 250000
Emission maximum, nm: 662
Fluorescence quantum yield: 0.2
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