Protein Labeling Reagents

Various reagents designed to selectively label target proteins. Products include classic dyes, radioisotope labels, biotinylation reagents, fluorescent labels, molecular probes, assays, and labeling kits.

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Invitrogen™ Biotin Azide (PEG4 carboxamide-6-Azidohexanyl Biotin)

biotin azide (PEG4 carboxamide-6-azidohexanyl biotin)

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Invitrogen™ Rhodamine Red™-X, Succinimidyl Ester, 5-isomer

Rhodamine Red™-X, Succinimidyl Ester, 5-isomer

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Invitrogen™ pHrodo™ Green STP Ester

pHrodo™ Green STP Ester

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Invitrogen™ Alexa Fluor™ 594 Hydrazide, for microinjection

Alexa Fluor™ 594 Hydrazide is useful as a cell tracer and as a reactive dye for labeling aldehydes or ketones in polysaccharides or glycoproteins.

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Invitrogen™ Alexa Fluor™ 488 C₅ Maleimide

Alexa Fluor™ 488 is a bright, green fluorescent dye with excitation ideally suited to the 488 nm laser line.

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Invitrogen™ Alexa Fluor™ Plus Amine-Reactive Dyes

Discover Alexa Fluor Plus amine-reactive dyes, the next-generation fluorescent labeling solution. Engineered to minimize nonspecific staining and enhance signal-to-noise ratios, these dyes ensure precise detection of low-abundance targets. Achieve bright, reliable imaging with reduced background interference.

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Specifications

Labeling Target	Primary amines
Content And Storage	-25°C to 8°C
Format	Amine-reactive dye
Product Type	Amine-reactive Dye
Formulation	Solid
Solubility	DMSO
Label Type	Alexa Fluor
Product Line	Alexa Fluor
Detection Method	Fluorescence

Thermo Scientific™ EZ-Link™ Sulfo-NHS-Biotin

Thermo Scientific™ EZ-Link™ Sulfo-NHS-Biotin is a short-chain, water-soluble biotinylation reagent for labeling antibodies, proteins and other molecules that have primary amines.

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Specifications

Cell Permeability	Cell-Impermeant
Product Type	Sulfo-NHS-Biotin
Spacer	Short
Label or Dye	Biotin
Solubility	DMF (Dimethylformamide),DMSO (Dimethylsulfoxide),Water
Chemical Reactivity	Amine
Product Line	EZ-Link

Invitrogen™ SiteClick™ sDIBO Alkyne Kits for Antibody Labeling

Easily attach Alexa Fluor™ pHrodo™ and Biotin sDIBO Alkyne tags to azido-modified antibodies using SiteClick™ chemistry.

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Specifications

Shipping Condition	Wet Ice
Labeling Target	Azido modified antibodies
Content And Storage	Store in refrigerator (2°C to 8°C) and protect from light.
Labeling Method	Click Chemistry
Chemical Reactivity	Azide

Thermo Scientific™ EZ-Link™ Sulfo NHS-LC-LC-Biotin, No-Weigh™ Format

Thermo Scientific EZ-Link Sulfo-NHS-LC-LC-Biotin enables simple and efficient biotin labeling of antibodies, proteins, and any other primary amine–containing macromolecules.

Pricing and Availability
Specifications

Label Type	Biotin & Analogs

Invitrogen™ Alexa Fluor™ 546 NHS Ester (Succinimidyl Ester)

Alexa Fluor™ 546 is a bright yellow dye. Used in imaging and flow cytometry, Alexa Fluor™ 546 dye is water soluble and pH-insensitive from pH 4 to pH 10.

Pricing and Availability
Specifications

Shipping Condition	Room Temperature
Content And Storage	Store in freezer (-5 to -30°C) and protect from light.
Product Type	Dye
Label or Dye	Alexa Fluor™ 546
Reactive Moiety	Active Ester, Succinimidyl Ester
Emission	570 nm
Excitation	554 nm
Label Type	Alexa Fluor
Chemical Reactivity	Amine
Product Line	Alexa Fluor

Invitrogen™ Alexa Fluor™ 430 NHS Ester (Succinimidyl Ester)

Used for stable signal generation in imaging and flow cytometry, Alexa Fluor™ 430 dye is water soluble and pH-insensitive from pH 4 to pH 10.

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Thermo Scientific™ DyLight™ 515-LS NHS Ester

Label antibodies or other proteins for FRET and multiplex fluorescence assays using fluors with large Stokes shifts (488nm excitation; yellow to far-red emission).