Water soluble sulfo-Cyanine3 dye, free unactivated monofunctional carboxylic acid. This reagent can be used as a reference fluorophore for Cy3® detection channel, as a control in experiments with other sulfo-Cyanine3 labeled products. Carboxylic acid can be also activated with carbodiimides.
Absorbance and emission spectra are identical with Cy3® fluorophore.
Download in 
ChemDraw format
General properties
| Appearance: | dark red crystals | 
| Molecular weight: | 638.17 | 
| Molecular formula: | C30H35N2NaO8S2 | 
| 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: | 548 | 
| ε, L⋅mol−1⋅cm−1: | 162000 | 
| Emission maximum, nm: | 563 | 
| Fluorescence quantum yield: | 0.1 | 
| CF260: | 0.03 | 
| CF280: | 0.06 |