ATTO 425 is a new fluorescent label with a coumarin structure. Characteristic features of the label are high fluorescence quantum yield, large Stokes-Shift, and high stability within the physiological pH-range. The dye is moderately hydrophilic. Its NHS-ester and maleimide show excellent solubility in polar solvents like DMF, DMSO or acetonitrile. For details of coupling see our recommended labeling procedure (PDF).

ATTO 425 is supplied as a crystalline, solvent-free solid. Its fluorescence can be excited efficiently in the range 405 - 455 nm.