Pacific Orange dye

Pacific Orange dye is a bright orange-fluorescent dye optimally excited by the 405 nm line of the violet laser and with excitation/emission at 400/551 nm. Conjugates of this dye are strongly fluorescent even at neutral pH.

Pacific Blue, Pacific Green and Pacific Orange dye conjugates can be simultaneously excited at 405 nm and emit at 455 nm, 500 nm and 551 nm, respectively, facilitating three-color analysis.

We offer Pacific Orange dye conjugated to a variety of primary antibodies, secondary antibodies and streptavidin. In addition, reactive and protein labeling kits are available so that you can produce your own antibody conjugates or probes.

Pacific Orange dye dashboard

Initial brightness

Pacific Orange dye is an orange fluorophore used primarily for flow cytometry, optimally excited by the 405 nm violet laser line. 

Photostability in buffer


Pacific Orange dye products

We offer a broad range of Pacific Orange dye products including protein and antibody labeling kits, labeled antibodies, bioconjugates and more:

See all Pacific Orange Primary Antibodies
See all Pacific Orange Secondary Antibodies

Pacific Orange™ dye

Fluorescence excitation and emission spectra of Pacific Orange dye.

Pacific Orange reactive dyes

Select dye-labeling chemistries for conjugation with the following reactive groups: 

Pacific Orange dye protein/antibody labeling kits

Select an optimized labeling kit for your target antibody or protein:

Target proteinKitCat. No.
Site-specific antibody labeling
<1–20 µg mouse IgG1Zenon Pacific Orange Mouse IgG1 Labeling KitZ25256
Conventional antibody/protein labeling
100 µg antibody/proteinPacific Orange Antibody/Protein Labeling KitP30014
1 mg antibody/proteinPacific Orange Antibody/Protein Labeling KitP30016

Violet laser–compatible antibody conjugates

We offer Pacific Blue, Pacific Green and Pacific Orange dyes as well as Qdot probes for use with the violet laser. In addition to primary and secondary antibody conjugates of these dyes, we’ve developed kits for cell proliferation, immunophenotyping, dead cell discrimination, apoptosis, and cell cycle analysis—all aimed at helping you maximize the data you can get from your violet laser–equipped flow cytometer.

Learn more about Cell Health and Viability Assays for Flow Cytometry



Excitation spectra (dotted lines) and emission spectra (solid lines) for Molecular Probes violet laser–excited Pacific Blue dye (blue), Pacific Green dye (green), and Pacific Orange dye (orange). The shaded area represents the emission bandpass filter (522/31) used for detection of the Pacific Green dye.

Not for resale. Super Bright Polymer Dyes are sold under license from Becton, Dickinson and Company.

Brilliant Ultra Violet™ and Brilliant Violet™ are trademarks or registered trademarks of Becton, Dickinson and Company or its affiliates, and is used under license.

For Research Use Only. Not for use in diagnostic procedures.