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Janelia Fluor® 646, Maleimide is a red fluorogenic 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) and STED 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.
Please see the product protocol for further information and a guide to protein/antibody labeling.
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
|Extinction Coefficient (ε)||152,000 M-1cm-1|
|Quantum Yield (φ)||0.54|
|Closest Laser line||640 nm|
|Correction Factor 260||0.09|
|Correction Factor 280||0.19|
|Application||Confocal imaging, dSTORM, STED, Flow|
|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.
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.Spectral 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|
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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The following protocol features additional information for the use of Janelia Fluor® 646, Maleimide (Cat. No. 6590).
Tocris offers the following scientific literature in this area to showcase our products. We invite you to request* your copy today!
*Please note that Tocris will only send literature to established scientific business / institute addresses.
This product guide provides a background to the use of Fluorescent Dyes and Probes, as well as a comprehensive list of our: