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Cy3.5 NHS ester (non-sulfonated)

Catalog No.
Labeling of amino-groups in biomolecules.
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Cyanine3.5 NHS ester is a dye for labeling of oligonucleotides, peptides and proteins which contain amino-groups. For fluorescence imaging and other fluorescence-based biochemical analysis, it has been used to label biological molecules too. Cy3.5 dyes have enhanced fluorescence upon binding to proteins. The excitation peak and emission peak of Cy3.5 dye is around 550nm and 590nm respectively. Most derivatives of non-sulfonated cyanines have low aqueous solubility except for hydrochlorides of hydrazides and amines. 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.

The ENU cells immersed in 0.3 mM Cy3.5 NHS ester with modified balanced salt solution (MBSS) showed that Cy3.5 NHS ester does not label the dead cells [1].

1.  XueYi Xie. Tumor angiogenesis, O2 saturation, glucose and amino acid metabolisms study using functional imaging. PhD thesis.

Chemical Properties

Physical AppearanceA solid
Storage24 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Avoid prolonged exposure to light. Desiccate.
Solubility≥69mg/mL in DMSO, ≥7.29 mg/mL in EtOH with ultrasonic,insoluble in H2O
Chemical Name2-((1E,3E)-3-(3-butyl-1,1-dimethyl-1H-benzo[e]indol-2(3H)-ylidene)prop-1-en-1-yl)-3-(6-((2,5-dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)-1,1-dimethyl-1H-benzo[e]indol-3-ium
SDFDownload SDF
Canonical SMILESCC1(C)C2=C3C(C=CC=C3)=CC=C2[N+](CCCCCC(ON4C(CCC4=O)=O)=O)=C1/C=C/C=C5C(C)(C)C6=C(C=CC=C7)C7=CC=C6N\5CCCC
Shipping ConditionEvaluation sample solution : ship with blue ice.All other available size: ship with RT , or blue ice upon request
General tipsFor 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) 591 Emission max (nm) 604
Extinction Coefficient (M-1cm-1) 116000 Quantum Yield 0.35
CF260 0.29 CF280 0.22

Quality Control

Chemical structure

Cy3.5 NHS ester (non-sulfonated)

Related Biological Data

Cy3.5 NHS ester (non-sulfonated)