Toggle Nav

Cy5 carboxylic acid (non-sulfonated)

Catalog No.
Non-reactive fluorophore, for control experiments, and for calibration
Grouped product items
SizePriceStock Qty
In stock
In stock

Tel: +1-832-696-8203

Email: [email protected]

Worldwide Distributors


Cy5 carboxylic acid is a non-activated carboxylic acid with low aqueous solubility. For coupling with amines, or protein labeling, Cy5 NHS ester and water-soluble sulfo-Cy5 NHS ester is preferred. This labeling dye has limited water solubility. 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.

In the cells, The Cy5 carboxylic acid label on the dye can track the efficiency of the protein expression [1].

[1] Deyle, K. M.; Farrow, B.; Hee, Y.Q.; Work, J.; Wong, M.; Lai, B.; Umeda, A.; Millward, S.W.; Nag, A.; Das, S.; Heath, J.R. A protein-targeting strategy used to develop a selective inhibitor of the E17K point mutation in the PH domain of Akt1. Nature Chemistry,2015, 7, 455–462.

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≥51.9mg/mL in DMSO, ≥89 mg/mL in EtOH,insoluble in H2O
Chemical Name6-[(2E)-3,3-dimethyl-2-[(2E,4E)-5-(1,3,3-trimethylindol-1-ium-2-yl)penta-2,4-dienylidene]indol-1-yl]hexanoic acid
SDFDownload SDF
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) 646 Emission max (nm) 662
Extinction Coefficient (M-1cm-1) 250000 Quantum Yield 0.2
CF260 0.03 CF280 0.04

Quality Control

Quality Control & MSDS

View current batch:

Chemical structure

Cy5 carboxylic acid (non-sulfonated)

Related Biological Data

Cy5 carboxylic acid (non-sulfonated)