BP Fluor 647-PEG-CH2COOH, MW 2,000 is a polyPEG dye comprised of BP Fluor 647, which is a bright green-fluorescent dye optimal for use with the 633, 650 nm Argon laser. The dye is water soluble and pH-insensitive from pH 4 to pH 10. The dye has 4 sulfonate groups to make it very water soluble and less aggregating in the aqueous solution. The free carboxylic acid can react with amines in the presence of a coupling agent such as HATU. With this reagent, BP Fluor 647 can be attached to nearly any amine-bearing molecule.
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