XFD647 NHS Ester *Same Structure to Alexa Fluor(TM) 647 NHS Ester*

Molecular weight: 1259.66, Excitation (nm): 650, Emission (nm), 671, Extinction coefficient (cm-1 M-1): 270000, Quantum yield: 0.33, Correction factor (280 nm): 0.03. XFD647 is manufactured by AAT Bioquest, and it has the same chemical structure of Alexa Fluor(R) 647 (Alexa Fluor® is the trademark of ThermoFisher). It is a bright red fluorescent dye. XFD647 dye is water soluble and pH-insensitive from pH 4 to pH 10. The NHS ester (or succinimidyl ester) of XFD647 is the most convenient amine-reactive form for conjugating this dye to a protein or antibody.