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Janelia Fluor® 646, Maleimide
Red fluorescent dye, supplied with a maleimide reactive group for conjugation (thiol reactivity). Suitable for confocal fluorescent imaging, super resolution microscopy (SRM) techniques such as dSTORM (live and fixed cells), STED and PAINT imaging. Can be multiplexed for two color imaging with Janelia Fluor® 549 SE (Cat. No. 6147). Cell permeable. Excitation maximum = 646 nm; emission maximum = 664 nm. Quantum yield = 0.54; Max. extinction coefficient = 152,000 M-1cm-1 (measured in ethanol plus 0.1% TFA); A280 correction factor is 0.19.
To measure the absorbance spectrum of this dye we recommend the following solvent: ethanol or trifluoroethanol plus 0.1% TFA.
We also offer Janelia Fluor® conjugated antibodies and custom conjugation services with our sister company Novus Biologicals.
Sold under license from the Howard Hughes Medical Institute, Janelia Research Campus
Janelia Fluor® 646, Maleimide Dye Spectra
|Extinction coefficient (ε)||152,000 M-1cm-1|
|Quantum yield (φ)||0.54|
|Closest Laser line||640 nm|
|Alternative for||Alexa Fluor® 647, Atto 647, Atto 647N*, CF640R, CF647, Cyanine 5|
Alexa Fluor® is a registered trademark of Molecular Probes, Inc, a Thermo Fisher Scientific Company.
Plan Your Experiments
Use our spectra viewer to interactively plan your experiments, assessing multiplexing options. View the excitation and emission spectra for our fluorescent dye range and other commonly used dyes.Spectra Viewer
|Storage||Store at -20°C|
The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.
Tocris products are intended for laboratory research use only, unless stated otherwise.
|Solvent||Max Conc. mg/mL||Max Conc. mM|
Preparing Stock Solutions
The following data is based on the product molecular weight 618.75. Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.
|Concentration / Solvent Volume / Mass||1 mg||5 mg||10 mg|
|1 mM||1.62 mL||8.08 mL||16.16 mL|
|5 mM||0.32 mL||1.62 mL||3.23 mL|
|10 mM||0.16 mL||0.81 mL||1.62 mL|
|50 mM||0.03 mL||0.16 mL||0.32 mL|
References are publications that support the biological activity of the product.
Grimm et al (2015) A general method to improve fluorophores for live-cell and single-molecule microscopy. Nat.Methods 12 244 PMID: 25599551
If you know of a relevant reference for Janelia Fluor® 646, Maleimide, please let us know.
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