Jackson Immuno Research Inc.
specializing in secondary antibodies and conjugates

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Whole IgG Affinity-Purified Secondary Antibodies

"I have used a wide variety of secondaries and Jackson ImmunoResearch has consistently been the best. The fluorophores are bright and stable and their selective (x reactivity removed) secondaries have always shown species specificity in multiple labeling."

Janet Duerr, Ohio University

Rating: 5.0

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Alexa Fluor® 647

Alexa Fluor® 647 Technical Information

Alexa Fluor® 647 - conjugated antibodies absorb light maximally around 651 nm and fluoresce maximally around 667 nm. They are brighter than Cy™5 in aqueous mounting media. Alexa Fluor® 647 conjugates are the best choice of far-red emitting dyes for multiple labeling detection with a confocal microscope, and are also widely used in flow cytometry. A significant advantage of long wavelength dyes such as Alexa Fluor® 647 is the low autofluorescence of biological specimens in this region of the spectrum. However, because of its peak emission at 667 nm, Alexa Fluor® 647 cannot be seen well by eye, and it cannot be excited optimally with a mercury lamp. Therefore, Alexa Fluor® 647 is most commonly visualized with a confocal microscope equipped with an appropriate laser for excitation and a far-red detector.

Alexa Fluor® 647 has good color separation from DyLight™ 405, Alexa Fluor® 488, and Rhodamine Red-X for effective 4-color imaging.

Alexa Fluor® 647 is available conjugated to:

Excitation Peak (nm) Emission Peak (nm)
Alexa Fluor® 647 651 667

Spectra Viewer

Use the spectra viewer below to compare Alexa Fluor® 647 with other fluorophores, along with instrument specifics (laser/filter) for suitability in your assay.

  • Alexa Fluor® fluorescent dyes is a trademark of Life Technologies Corp.