Alexa Fluor® 568 dyeInvitrogen Alexa Fluor 568 dye is a bright, orange-fluorescent dye with excitation ideally suited for the 568 nm laser line on the Ar-Kr mixed-gas laser. For stable signal generation in imaging and flow cytometry, Alexa Fluor 568 dye is pH-insensitive over a wide molar range.

Probes with high fluorescence quantum yield and high photostability allow detection of low-abundance biological structures with great sensitivity. Alexa Fluor 568 dye molecules can be attached to proteins at high molar ratios without significant self-quenching, enabling brighter conjugates and more sensitive detection.

We offer Alexa Fluor 568 dye conjugated to a variety of antibodies, peptides, proteins, tracers, and amplification substrates optimized for cellular labeling and detection. In addition, reactive dye forms and protein labeling kits are available to allow you to generate your own antibody conjugates or probes.

Alexa Fluor 568 dye dashboard

Initial brightness

Bright and photostable orange-red dye that matches well with RFP filter sets. In addition, is used in stochastic optical reconstruction microscopy (STORM)—as a reporter in dSTORM.  

Photostability in buffer


Photostability in antifade


Performance in SRM


  568 Texas Red 578 603  
Laser line

Common filter set

Excitation max

Emission max


Fixed and permeabilized muntjac skin fibroblasts stained with Invitrogen Alexa Fluor 488 phalloidin, an anti–α-tubulin antibody, and an anti–cdc6 peptide antibody. The anti–α-tubulin antibody was prelabeled with the Invitrogen Zenon Alexa Fluor 568 Mouse IgG1 Labeling Kit, and the anti–cdc6 peptide antibody was prelabeled with the Zenon Alexa Fluor 350 Mouse IgG1 Labeling Kit.

Alexa Fluor 568 reactive dyes

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

Amine Thiol Aldehyde, ketone, carboxylate, or phosphate

Alexa Fluor 568 protein/antibody labeling kits

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

Target protein Kit Cat. No.
Site-specific antibody labeling
<1–20 µg mouse IgG1 Zenon Alexa Fluor 568 Mouse IgG1 Labeling Kit Z25006
<1–20 µg mouse IgG2a Zenon Alexa Fluor 568 Mouse IgG2a Labeling Kit Z25106
<1–20 µg rabbit IgG Zenon Alexa Fluor 568 Rabbit IgG Labeling Kit Z25306
Conventional antibody/protein labeling
10–20 µg antibody APEX Alexa Fluor 568 Antibody Labeling Kit A10494
100 µg antibody/protein Alexa Fluor 568 Antibody/Protein Labeling Kit A20184
1 mg antibody/protein Alexa Fluor 568 Antibody/Protein Labeling Kit A10238
Alexa Fluor Dye stained cell

Alexa Fluor dye family

Alexa Fluor dyes are among the most trusted fluorescent dyes available today. Learn more about the:

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