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™ Alexa Fluor™ 488 NHS Ester (Succinimidyl Ester)

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

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™ 488
Emission	517 nm
Excitation	494 nm
Label Type	Alexa Fluor
Chemical Reactivity	Amine
Product Line	Alexa Fluor

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

Thermo Scientific™ EZ-Link™ Sulfo-NHS-LC-Biotin is an intermediate-length, water-soluble biotinylation reagent for labeling antibodies, proteins and other molecules that have primary amines.

Pricing and Availability
Specifications

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

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

Thermo Scientific™ EZ-Link™ Sulfo-NHS-SS-Biotin No-Weigh™ Format is a water-soluble, NHS-ester biotinylation reagent whose spacer arm includes a cleavable disulfide bond for reversible labeling of proteins and cell surface primary amines.

Pricing and Availability
Specifications

Chemical Reactivity	Amine

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Invitrogen™ Alexa Fluor™ 647 C₂ Maleimide

Alexa Fluor™ 647 is a bright, far-red fluorescent dye with excitation ideally suited for the 594 nm or 633 nm laser lines.

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Invitrogen™ Alexa Fluor™ 647 Azide, Triethylammonium Salt

The far red-fluorescent Alexa Fluor™ 647 azide is reactive with terminal alkynes via a copper-catalyzed click reaction.

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

Pricing and Availability
Specifications

Label Type	Biotin & Analogs

Thermo Scientific™ EZ-Link™ Maleimide-PEG2-Biotin, No-Weigh™ Format

Biotinylate reduced cysteines with this short, maleimide-activated, sulfhydryl-reactive biotinylation reagent containing a 2-unit PEG spacer arm to enhance water solubility.

Pricing and Availability
Specifications

Cell Permeability	Cell-Impermeant
Product Type	Maleimide-PEG2-Biotin
Label or Dye	Biotin
Solubility	DMF (Dimethylformamide),DMSO (Dimethylsulfoxide),Water
Reactive Moiety	Maleimide
Chemical Reactivity	Thiol
Product Line	EZ-Link

Invitrogen™ Click-iT™ Cell Reaction Buffer Kit

Clicks the two moieties together

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Invitrogen™ Alexa Fluor™ 405 NHS Ester (Succinimidyl Ester)

Alexa Fluor™ 405 is a blue-fluorescent dye optimal for use with the 405 nm violet laser.

Pricing and Availability
Specifications

Shipping Condition	Room Temperature
Product Type	Dye
Label or Dye	Alexa Fluor™ 405
Reactive Moiety	Active Ester, Succinimidyl Ester
Label Type	Alexa Fluor
Chemical Reactivity	Amine
Product Line	Alexa Fluor

Invitrogen™ 4-Acetamido-4'-Maleimidylstilbene-2,2'-Disulfonic Acid, Disodium Salt

4-acetamido-4'-maleimidylstilbene-2,2'-disulfonic acid, disodium salt

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Invitrogen™ Alexa Fluor™ Carboxylic Acid, tris(triethylammonium) salts

Alexa Fluor Carboxylic Acid tris(triethylammonium) salts are non-reactive forms of the Alexa Fluor dye that can be used as a reference standard for dye-conjugates. Choose from ten different Alexa Fluor free acid dyes that span the spectrum, from 350 to 750 nm, to meet your research needs.

Pricing and Availability
Specifications

Content And Storage	Store in freezer (-5 to -30°C). Protect from light.
Reactive Moiety	Free acid
Quantity	5 mg
Label Type	Alexa Fluor
Product Line	Alexa Fluor

Thermo Scientific™ EZ-Link™ NHS-PEG12-Biotin, No-Weigh™ Format

Biotinylate protein amines and maximize solubility of proteins with this very long (56.0A) NHS-ester biotinylation reagent containing a pegylated, water-soluble spacer arm.