AF 647 carboxylic acid

AF 647 carboxylic acid is a derivative of the far-infrared dye AF 647. AF 647 is often used as a replacement for Cy5 dye, with an excitation wavelength (λex) of 635 nm (conventional fluorescence detection)/620 nm (instantaneous detection). The maximum excitation wavelength is 647 nm and the maximum emission wavelength is 671 nm. AF 647 carboxylic acid has a carboxylic acid group and can be coupled to biomolecules with amino groups to achieve dye labeling.