Thermo Scientific™

DyLight™ 800 NHS Ester

Catalog number: 46421
Thermo Scientific™

DyLight™ 800 NHS Ester

Catalog number: 46421
Catalog Number
Unit Size
1 mg
Price (USD)
Your Price:
Catalog NumberUnit SizePrice (USD)AvailabilityQuantity
464211 mg
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Product Overview
Citations & References
Additional Information
Thermo Scientific DyLight 800 Amine-Reactive Dye is an NHS ester-activated derivative of high-performance DyLight 800 used to fluorescently label antibodies and other proteins that are then used as molecular probes for cellular imaging and other fluorescence detection methods.

DyLight 800 is a near-IR fluor that is invisible to the naked eye but increases the staining options when using infrared imaging systems. DyLight 800 has spectral properties that are very similar to other near-IR dyes, including Alexa Fluor™ 790 and IRDye™ 800. The high water solubility of DyLight Fluors means that a high dye-to-protein ratio can be attained without causing precipitation of the conjugates. DyLight 800 Amine-Reactive Dye is also available as part of two antibody labeling kit sizes.

Features of DyLight 800 NHS Ester:

High performance— DyLight 800 replaces Alexa Fluor 800 and IRDye 800 for near-infrared staining
Specific— NHS ester-activated dye labels proteins and other molecules at primary amines (-NH2)
Optimized procedure— following the standard protocol results in antibodies with excellent dye:protein ratios and recovery rates for optimum activity and fluorescence labeling

• Primary antibody labeling for immunofluorescence microscopy, immunohistochemistry (IHC), Western blotting or ELISA assay
• Target protein labeling for in vitro and in vivo fluorescent detection strategies

DyLight 800 Amine-Reactive Dye is activated with an N-hydroxysuccinimide (NHS) ester moiety to react with exposed N-terminal α-amino groups or the ε-amino groups of lysine residues to form stable amide bonds. Learn more about NHS ester chemistry.

Typical labeling reactions require the dye to first be dissolved in anhydrous dimethyl formamide (DMF) or another suitable organic solvent before adding a specific molar amount of dye to an amine-free buffer containing the protein to be labeled. However, the high solubility of DyLight Fluors permits protein solutions to be added directly to specific amounts of the labeling reagent. This feature allows DyLight 800 Amine-Reactive Dye to be provided in multiple formats with flexible protocols to achieve efficient degrees of labeling.

We also offer Standard and Microscale DyLight 800 Antibody Labeling Kits for fast and efficient fluorescent labeling of antibodies for use in fluorescence methods. The standard size kit contains all necessary components to perform three separate labeling reactions using 1 mg of IgG or similar quantities of other proteins. The microscale kit contains all of the necessary components to perform five separate labeling reactions using 100 µg of IgG. Both kit sizes include the Amine-Reactive DyLight 800 NHS-ester in convenient single-use vials as well as purification resin and spin columns for the preparation of ready-to-use conjugate.

Related Products
DyLight™ 800 Antibody Labeling Kit
DyLight™ 800 Microscale Antibody Labeling Kit
For Research Use Only. Not for use in diagnostic procedures.


Chemical Reactivity
Excitation⁄Emission (nm)
Label or Dye
DyLight™ 800
Product Line
Product Size
1 mg
DMF (Dimethylformamide)

Contents & Storage

Store desiccated at -20°C.


Frequently asked questions (FAQs)

Citations & References