Flamma® 552 Maleimide

Flamma® Fluors 552 Maleimide is a thiol reactive bright yellow dye that used to generate a stable fluorescence signal in bioimaging. The maxima of Ex/Em values are at 550/564 nm, similar to that of Alexa 555, DyLight 549 ATTO 550 and Cy 3. Flamma 552 might be excited using 543, 546 or 555 nm laser line and displays excellent optical property. Flamma 552 maleimide can be conjugated to low-abundance of biomolecules with great sensitivity allowing sensitive detection. Maleimides selectively label thiols of cysteine residue via 1,4-addition pathway, without interacting with amines, to form thioether linkage. Maleimides apparently do not react with methionine, histidine or tyrosine, but they might react with primary amines under strong basic environment. BioActs offers Flamma® 552 maleimide for labeling of thiols on antibodies, peptides, proteins, ligands and amplification substrates optimized for cellular labeling and detection.