RB-PEG-NH2 (MW 1000)

RB-PEG-NH2 (MW 1000) (Rhodamine B-PEG-NH2 (MW 1000) ) is a fluorescent dye composed of Rhodamine B, PEG, and an amino group. Its reactive primary amine (NH2) group can rapidly react with activated carboxylic acids, such as NHS esters, to form a stable amide bond, emitting fluorescence at Ex/Em = 546/610 nm.