Non-activated sulfo-Cyanine5 carboxylic acid, water soluble dye. This dye is highly hydrophilic and water-soluble. Non-sulfonated analog is available.
The fluorophore is an equivalent of Cy5® carboxylic acid.
For labeling applications consider using pre-activated sulfo-Cy5 NHS ester
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General properties
| Appearance: | dark blue powder | 
| Molecular weight: | 664.76 | 
| CAS number: | 1121756-16-8, 1144162-77-5 | 
| Molecular formula: | C32H37N2NaO8S2 | 
| Solubility: | Good in water, DMF, DMSO. Low in non-polar organic solvents. | 
| Quality control: | NMR 1H, HPLC-MS (95%) | 
| 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. | 
  Spectral properties
| Excitation maximum, nm: | 646 | 
| ε, L⋅mol−1⋅cm−1: | 271000 | 
| Emission maximum, nm: | 662 | 
| Fluorescence quantum yield: | 0.28 | 
| CF260: | 0.04 | 
| CF280: | 0.04 |