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DyLight 550-2xPEG Sulfhydryl-Reactive Dye

PEGylated dye for enhanced fluorescence and reduced non-specific binding.

DyLight 550-2xPEG Sulfhydryl-Reactive Dye

Thermo Scientific DyLight 550-2xPEG Sulfhydryl-Reactive Dye is a maleimide-activated derivative of our high-performance DyLight 550 Dye used to fluorescently label cysteine-containing peptides, proteins or other biomolecular probes.

The DyLight 550-2xPEG Dye contains 2 polyethylene glycol (PEG) chains that are non-toxic, enhance fluorescence and reduce nonspecific binding of conjugates made with them. Conjugates made with DyLight 550-2xPEG Dye can be used as molecular probes for cellular imaging, flow cytometry and other fluorescence detection methods.The PEG chains also improve solubility of the dyes and labeled molecules in aqueous solution, aid in cell permeability and improve tissue retention.


  • High fluorescence intensity – significantly brighter fluorescence than Alexa Fluor™ 555
  • PEGylated – improves solubility in aqueous solution and aids in cell permeability
  • Specific – maleimide-activated dye labels proteins and other molecules at reduced sulfhydryls (-SH)


  • Fluorescence microscopy
  • In vivo or ex vivo imaging
  • Cell-based assays
  • Flow cytometry/fluorescence-activated cell sorting (FACS)

Product Details:

DyLight 550-2xPEG 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 550 Fluorophore Overview Page
Complete DyLight Fluor Product Guide

Related Products:

DyLight 550 Sulfhydryl-Reactive Dye (not PEGylated)
Dye Removal Columns
Pierce Immunostain Enhancer
Fluorescent Counterstains

Ordering Information
Product # Description Pkg. Size Instructions MSDS CofA Price
62292 DyLight 550-2xPEG Maleimide
Formulation: Maleimide activated proprietary orange fluorescent dye
Sufficient For: 1 use to label a total of 7mg of IgG using typical conditions
1mg Product Instructions for product #62292 DyLight 550-2xPEG Maleimide MSDS for product #62292 DyLight 550-2xPEG Maleimide Certificate of Analysis for product #62292 DyLight 550-2xPEG Maleimide $314.00

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Instructions | MSDS | CofA
Product Instructions | MSDS | CofA  

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