Janelia Fluor® 646b, NHS ester New
Chemical Name: 2,5-Dioxopyrrolidin-1-yl 3,7-di(azetidin-1-yl)-5,5-dimethyl-3'H,5H-spiro[dibenzo[b,e]siline-10,1'-isobenzofuran]-6'-carboxylate
Purity: ≥90%
Biological Activity
Spontaneously Blinking Janelia Fluor® Dyes allow facile single-molecule localization microscopy (SMLM) in cells and dense biomolecular structures, without the need for photoactivation or redox buffers. These spontaneously blinking dyes harness Janelia Fluor® technology to delivery dyes that automatically cycle between 'off' and 'on' states with an ideal duty cycle for super resolution microscopy experiments.Key Information: Janelia Fluor® 646b, NHS ester is a spontaneously blinking fluorescent dye, supplied with an NHS ester reactive group for the labeling of primary amines. Suitable for DNA labeling using amine-terminated oligonucleotides in RNA-FISH experiments.
Application: suitable for super resolution microscopy (SRM) including single-molecule localization microscopy (SMLM).
Properties and Photophysical Data: derived from Janelia Fluor® 646, SE (Cat. No. 6148). Excitation and emission maxima (λ) are 662 nM and 678nM, respectively.
Janelia Fluor is a registered trademark of Howard Hughes Medical Institute.
Scientific Data
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Application of Janelia Fluor® 646b, NHS ester. SOFI RNA-FISH image of mouse embryo fibroblast cells expressing MS2 in the 3′ UTR of the beta-actin gene and labeled with Janelia Fluor®646b-oligonucleotide from Janelia Fluor® 646b, NHS ester; scale bar: 5 μm. Image kindly provided by Luke D. Lavis, Janelia Research Campus. For more information on this work read Luke D. Lavis et al (2024) A series of spontaneously blinking dyes for super-resolution microscopy. ACS Chem.Biol. bioRxiv. PMID: 38766149
Optical Data for Janelia Fluor® 646b, NHS ester
| λabs | 679 nm |
|---|---|
| λem | 662 nm |
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.
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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
Product Datasheets
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