Protein Labeling Reagents

Thermo Scientific™ Alexa Fluor™ 420 NHS Ester (Succinimidyl Ester)

Greener Choice
Offers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”

Learn More

Alexa Fluor 420 NHS Ester is an amine-reactive dye optimized for multiplex IHC and spatial biology. A long Stokes shift and 420/500 ex/em make it a good match for the CFP filter.

Molecular Probes™ Alexa Fluor™ 488 5-SDP Ester (Alexa Fluor™ 488 Sulfodichlorophenol Ester)

Alexa Fluor™ 488 5-SDP ester (Alexa Fluor™ 488 sulfodichlorophenol ester)

Atto 633 NHS Ester BioReagent, Suitable for Fluorescence, 90% (Coupling to Amines), MilliporeSigma™ Supelco™

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.

Invitrogen™ Alexa Fluor™ 532 C₅ Maleimide

Alexa Fluor™ 532 C₅ Maleimide is a bright, yellow fluorescent dye with excitation ideally suited for the frequency-doubled Nd:YAG laser line.

Invitrogen™ Alexa Fluor™ 594 C₅ Maleimide

Alexa Fluor™ 594 is a bright, red fluorescent dye that can be excited using the 561 nm or 594 nm laser lines.

Molecular Probes™ Alexa Fluor™ 594 Azide (Alexa Fluor™ 594 Carboxamido-(6-Azidohexanyl), Triethylammonium Salt), mixed isomers

Alexa Fluor™ 594 Azide (Alexa Fluor™ 594 Carboxamido-(6-Azidohexanyl), Triethylammonium Salt), mixed isomers

Molecular Probes™ 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.

Invitrogen™ Alexa Fluor™ 568 Hydrazide, for microinjection

Alexa Fluor™ 568 Hydrazide is useful as a cell tracer and as a reactive dye for labeling aldehydes or ketones in polysaccharides or glycoproteins.

Invitrogen™ Alexa Fluor™ 350 NHS Ester (Succinimidyl Ester)

Used for stable signal generation in imaging and flow cytometry, Alexa Fluor™ 350 dye is water soluble and pH-insensitive from pH 4 to pH 10.

Molecular Probes™ Qdot™ 625 ITK™ Carboxyl Quantum Dots

Qdot™ 625 ITK™ carboxyl quantum dots

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.

Invitrogen™ Alexa Fluor™ 546 C₅ Maleimide

Alexa Fluor™ 546 is a bright, orange fluorescent dye that can be excited using the 488 nm or 532 nm laser lines.

Molecular Probes™ Alexa Fluor™ 488 Azide (Alexa Fluor™ 488 5-Carboxamido-(6-Azidohexanyl), Bis(Triethylammonium Salt)), 5-isomer

The green-fluorescent Alexa Fluor™ 488 azide is reactive with terminal alkynes via a copper-catalyzed click reaction.

Molecular Probes™ Alexa Fluor™ 647 Alkyne, Triethylammonium Salt

Alexa Fluor™ 647 alkyne, triethylammonium salt