XFD660 Maleimide

Extinction coefficient (cm^-1 M^-1): 132000. Excitation (nm): 663. Emission (nm): 691. XFD660, synthesized by AAT Bioquest, is chemically identical to Alexa Fluor(R) 660 (a ThermoFisher trademark). Designed for optimal excitation at 633 or 647 nm laser lines, XFD660 is well-suited for advanced imaging and flow cytometry applications, offering excellent fluorescence brightness and photostability. This dye is water-soluble and demonstrates pH stability within a range from 4 to 10. The maleimide derivative of XFD660 is commonly utilized for conjugation to thiol groups on proteins, oligonucleotide thiophosphates, or low molecular weight ligands, producing conjugates that exhibit significantly brighter fluorescence and enhanced photostability compared to those formed with other spectrally similar fluorophores.