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Cy5.5 NHS ester (non-sulfonated)
Labeling of amino-groups in biomolecules.

Catalog No.A8103
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Sample solution is provided at 25 µL, 10mM.

Product Citations

1. Jiang C, Qi Z, et al. "ATP-responsive low-molecular-weight polyethylenimine-based supramolecular assembly via host-guest interaction for gene delivery." Biomacromolecules. 2018 Dec 5. PMID:30516950
2. Lu J, Zhao Y, et al."Biofunctional polymer-lipid hybrid high density lipoprotein-mimicking nanoparticles loading anti-miR155 for combined antiatherogenic effects on macrophages." Biomacromolecules. 2017 Aug 3. PMID:28738148

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Chemical structure

Cy5.5 NHS ester

Related Biological Data

Cy3.5 NHS ester (non-sulfonated)

Related Biological Data

Cy3.5 NHS ester (non-sulfonated)

Related Biological Data

Cy3.5 NHS ester (non-sulfonated)

Cy5.5 NHS ester (non-sulfonated) Dilution Calculator

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Chemical Properties

Cas No. N/A SDF Download SDF
Synonyms N/A
Chemical Name 3-(6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)-1,1-dimethyl-2-((1E,3E,5E)-5-(1,1,3-trimethyl-1H-benzo[e]indol-2(3H)-ylidene)penta-1,3-dien-1-yl)-1H-benzo[e]indol-3-ium
Canonical SMILES CC1(C)C2=C3C(C=CC=C3)=CC=C2[N+](CCCCCC(ON4C(CCC4=O)=O)=O)=C1/C=C/C=C/C=C5C(C)(C)C6=C(C=CC=C7)C7=CC=C6N\5C
Formula C44H46ClN3O4 M.Wt 716.31
Solubility ≥35.8mg/mL in DMSO 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.
The product is not stable in solution, please dissolve it immediately before use.
Physical Appearance A solid Shipping Condition Evaluation sample solution : ship with blue ice.All other available size: ship with RT , or blue ice upon request
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.

Spectral properties

Excitation max (nm) 684 Emission max (nm) 710
Extinction Coefficient (M-1cm-1) 209000 Quantum Yield 0.2
CF260 0.07 CF280 0.03


Non-sulfonated cyanines are available for the labeling of many targets including:

• Soluble proteins, which are tolerant to addition of organic co-solvent • Fluorescence polarization (FP)
• Antibodies (with 5-10% of DMSO/DMF) • Fluorescence resonance energy transfer (FRET)
• DNA and oligonucleotides • Time-resolved fluorescence energy transfer (TR-FRET)
• Peptides • Fluorescence intensity (FI)
• Many small molecules  
• Reactions in organic media (dichloromethane, acetonitrile)  


Cyanine5.5 NHS ester is a reactive dye for the labeling of peptides, proteins, and oligonucleotides that contain amino-groups. Cy5.5-NHS ester is a near-infrared fluorescence dye able to dissolve in DMF and DMSO with the excitation maximum and emission maximum around 675 nm and 693 nm respectively [1]. The reagent is not only used for labeling moleculars contain amino groups but also used for labeling plasmid DNA [2].For biomolecule labeling, the labeling reagent has low aqueous solubility, using of organic co-solvent to dissolve this molecular is necessary for efficient reaction. First, Cyanine dye should be dissolved in organic solvent and then added to a solution of biomolecule in appropriate aqueous buffer.

Through the optical imaging of subcutaneous tumor xenografted mice, the subcutaneous U87MG tumor could be clearly distinguished from the surrounding background tissue from 30 min up to 24 h postinjection of 0.5 nmol Cy5.5-NHS. The tumor uptake of Cy5.5-NHS reached a maximum 30 minutes postinjection and slowly washed out over time [3].

[1].  Ju Hee Ryu, Jin Hee Na, Ho Kyung Ko, et al. Non-invasive optical imaging of cathepsin B with activatable fluorogenic nanoprobes in various metastatic models. Biomaterials, 2014, 35: 2302-2311.
[2].  Laura-Lee Farrell, Joel Pepin, Cezary Kucharski, et al. A comparison of the effectiveness of cationic polymers poly-L-lysine (PLL) and polyethylenimine (PEI) for non-viral delivery of plasmid DNA to bone marrow stromal cells (BMSC). European Journal of Pharmaceutics and Biopharmaceutics, 2007, 65: 388–397.
[3].  Zhen Cheng, Jelena Levi, Zhengming Xiong, et al. Near-Infrared Fluorescent Deoxyglucose Analog for Tumor Optical Imaging in Cell Culture and in Living Mice. Bioconjug Chem., 2006, 17(3):662-669.