Supplied in Phosphate Buffered Saline with 50% Glycerol, 2 mg/mL BSA and 0.05% Sodium Azide.
Storage
Shipped at 4°C. Upon delivery aliquot and store at -20°C. Avoid freeze/thaw cycles. This product is also photosensitive and should be protected from light. Should this product contain a precipitate we recommend microcentrifugation before use. CF® Dyes are guaranteed for at least 6 months from data of receipt when stored correctly.
General Notes
Looking for a specific protein conjugate to simplify your workflow? We offer a library of over 2,000 targets conjugated to your choice of CF® dye. To enquire about a custom product, contact us directly.
Disclaimer
This product is for research use only. It is not intended for diagnostic or therapeutic use.
CF®633 and CF®640R exhibit substantially greater photostability than Alexa Fluor® 647. Jurkat cells were stained with mouse anti-CD3 primary antibody followed by goat anti-mouse secondary antibodies conjugated to the indicated dyes. Cells were continuously illuminated using a mercury arc lamp with a Cy®5 filter cube, with images acquired every 15 seconds for 5 minutes. Fluorescence intensity was normalized to the initial time point.
This chart summarizes commonly used CF® dyes grouped by their suitability for specific imaging modalities, including alternative spectra applications, four-color confocal imaging, near-infrared western blotting, photoacoustic imaging, STED, SIM, STORM, TIRF, and two-photon microscopy. Each dye is shown with its characteristic excitation and emission wavelengths (nm), providing a practical reference for selecting spectrally compatible dyes and optimizing multicolor experimental design across a range of fluorescence techniques.
Relative photostability of CF®633 and Alexa Fluor® 647. Jurkat cells were stained with mouse anti-CD3 primary antibody followed by goat anti-mouse secondary antibodies conjugated to the indicated dyes. Cells were continuously illuminated using a mercury arc lamp with a Cy®5 filter cube, and fluorescence intensity was monitored over time.
CF®633 produces the brightest far-red antibody conjugates. Jurkat cells were stained with mouse anti-CD3 or an isotype control antibody, followed by goat anti-mouse secondary antibodies conjugated with varying degrees of labeling (DOL, dye molecules per antibody). Fluorescence was measured in the APC detection channel on a BD FACSCalibur™ flow cytometer, and bars represent geometric mean fluorescence intensity.
Normalized emission spectra of the CF® dye family spanning the visible to near-infrared range are shown, illustrating the spectral diversity and overlap between dyes. Curves represent relative fluorescence intensity as a function of emission wavelength (nm), with peak positions corresponding to each dye’s characteristic emission maximum. This reference highlights the broad coverage of CF® dyes for multicolor fluorescence applications and aids in selecting compatible dye combinations for imaging, flow cytometry, and other fluorescence-based assays.
Rat neuromuscular junction stained with CF®633 a-bungarotoxin to label acetylcholine receptors (magenta), with nuclei counterstained using DAPI (cyan).
