Janelia Fluor 526®, NHS ester
Chemical Name: 2-(3-(3,3-Difluoroazetidin-1-ium-1-ylidene)-6-(3,3-difluoroazetidin-1-yl)-2,7-difluoro-3H-xanthen-9-yl)-4-(((2,5-dioxopyrrolidin-1-yl)oxy)carbonyl)benzoate
Biological Activity
Key Information: Janelia Fluor 526®, NHS ester is a fluorogenic yellow fluorescent dye; supplied with an NHS ester reactive group for the labeling of primary amines.Application: Suitable for confocal microscopy, two-color lattice light-sheet microscopy, super resolution microscopy (SRM) including dSTORM (in both live and fixed cells) and STED. Cell permeable.
Properties and Photophysical Data: NHS ester can be converted to relevant substrate for use in self-labeling tag systems, e.g. HaloTag® and SNAP-tag®. Can be multiplexed for two color imaging with Janelia Fluor® 635 NHS ester (Cat. No. 6419). Excitation and emission maxima (λ) are 526 nm and 550 nm, respectively; quantum yield = 0.87; extinction coefficient = 118,000 M-1cm-1; lactone-zwitterion equilibrium constant (KL-Z) = 0.005.
To measure the absorbance spectrum of this dye we recommend the following solvent: TFE plus 0.1% TFA.
Please see the protocol for further information on protein/antibody labeling and conjugation.
We also offer Janelia Fluor® conjugated antibodies and custom conjugation services with our sister company Novus Biologicals.
HaloTag is a trademark of Promega Corporation, and SNAP-tag is a trademark of New England BioLabs, Inc.
Janelia Fluor is a registered trademark of Howard Hughes Medical Institute.
This product has been recently renamed. The previous name for this product was Janelia Fluor® 526, SE.
Optical Data for Janelia Fluor 526®, NHS ester
| Emission Color | Yellow |
|---|---|
| Brightness | |
| λabs | 526 nm |
| λem | 550 nm |
| Extinction Coefficient (ε) | 118,000 M-1cm-1 |
| Quantum Yield (φ) | 0.87 |
| Closest Laser line | 488 nm |
| Reactive Group | NHS ester |
| Reactivity | Primary amines |
| Cell Permeable | Yes |
| Application | Confocal Microscopy, Super Resolution Microscopy (SRM), Two-color Lattice Light-sheet Microscopy |
| Alternative For | Alexa Fluor® 532, Alexa Fluor® 514, Atto 532, CF514, CF532 |
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.
Spectral Viewer
Technical Data
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.
Additional Information
Background References
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Rational design of fluorogenic and spontaneously blinking labels for super-resolution imaging.
Zheng et al.
ACS Cent.Sci., 2019;5:1602
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