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DyLight 488 Sulfhydryl-Reactive Dye

Label cysteines with this alternative to Alexa Fluor™ 488, Cy2™ and FITC dyes.

DyLight 488 Sulfhydryl-Reactive Dye

Thermo Scientific DyLight 488 Sulfhydryl-Reactive Dye is a maleimide-activated derivative of high-performance DyLight 488 used to fluorescently label sulfhydryl-containing peptides, proteins and other biomolecular probes.

DyLight 488 has high fluorescence intensity over a broad pH range (pH 4-9) and is more photostable than Cy2™ dye, Alexa Fluor™ 488, FITC and LI-COR™ dyes in many applications. The high water solubility of DyLight Fluors allows a high dye-to-protein ratio to be achieved without causing precipitation of the conjugates.


  • High performance – DyLight 488 shows brighter fluorescence than Alexa Fluor 488, FITC and Cy2 dye
  • Specific – maleimide-activated dye labels proteins and other molecules at reduced sulfhydryls (-SH)
  • Efficient labeling methods – well-characterized chemistry and optimized protocols provide for reliable, high-quality labeling
  • Optimized antibody labeling procedure –complete protocol for IgG reduction and labeling and calculating the labeling efficiency


  • Antibody labeling for immunofluorescence applications, including immunocytochemistry (ICC), immunohistochemistry (IHC), Western blotting and ELISA assay
  • Target macromolecule labeling for in vitro and in vivo fluorescent detection strategies

Product Details:

Fluorescence detection of DyLight 488 dye
Immunofluorescence microscopy using DyLight 488 dye. Cytokeratin 18 (blue) and lamin A (green) in A549 cells were fluorescently labeled with specific primary antibodies and DyLight 405-Conjugated Highly Cross-Adsorbed Goat Anti-Rabbit or DyLight 488-Conjugated Goat Anti-Mouse Secondary Antibodies, respectively.

DyLight 488 Sulfhydryl-Reactive Dye is activated with a maleic acid imide (maleimide) moiety to form a reactive alkylation reagent. Labeling occurs through reaction of the maleimide-activated dye with reduced sulfhydryl groups (-SH) to form stable thioether bonds. Maleimides are specific for sulfhydryl groups between pH 6.5-7.5. Learn more about maleimide chemistry.

Related Resources:

DyLight 488 Fluorophore Overview Page
Complete DyLight Fluor Product Guide

Related Products:

All Fluorescent Labeling Reagents and Kits
DyLight Fluor Secondary Antibody Conjugates
DyLight Fluor Streptavidin and NeutrAvidin Conjugates
Krypton Fluorescent Protein Stains

Ordering Information
Product # Description Pkg. Size Instructions MSDS CofA Price
46602 DyLight 488 Maleimide
Formulation: Maleimide activated proprietary green fluorescent dye
Sufficient For: 1 use to label a total of 9mg of IgG using typical conditions
1mg Product Instructions for product #46602 DyLight 488 Maleimide MSDS for product #46602 DyLight 488 Maleimide Certificate of Analysis for product #46602 DyLight 488 Maleimide $210.00

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Instructions | MSDS | CofA
Product Instructions | MSDS | CofA  

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