AFDye™ 532 Maleimide (Alexa Fluor® 532 C5 Maleimide equivalent) is a water-soluble, photostable, and bright yellow-fluorescent dye with pH insensitive emission from pH 4 to pH 10. The excitation of AFDye™ 532 ideally suited for the frequency-doubled Nd:YAG laser line. AFDye™ 532 dye conjugated to a variety of antibodies, peptides, proteins, tracers, and amplification substrates often used for generation of stable signal in imaging and flow cytometry.
Maleimide is the most popular sulfhydryl-reactive reactive group for conjugating the dye to a thiol group on a protein, oligonucleotide thiophosphate, or low molecular weight ligand. The maleimide group specifically and efficiently reacts with reduced thiols (sulfhydryl groups, –SH) at pH 6.5 to 7.5 to form stable thioether bond. The resulting conjugates exhibit brighter fluorescence and greater photostability than the conjugates of many other spectrally similar fluorophores.
AFDye™ 532 Maleimdie dye structurally is identical Alexa Fluor™ 532 C5 Maleimide sold by ThermoFisher Scientific.