Fluoresbrite® carboxylate microspheres are fluorescent monodispersed polystyrene microspheres that have carboxylate groups on their surfaces which can be activated for the covalent coupling of proteins. Polysciences' Fluoresbrite® particles are used worldwide in phagocytosis and neural retrograde transport studies, and as markers for cell bound antigens. These microspheres are packaged as 2.5% aqueous suspensions.
Nominal Reference Values:

4.50µm particles packaged as 2.5% aqueous suspension.
4.99 x 108 particles/ml
Diameter Coefficient of Variation (CV) = 7%
Excitation max. = 441nm
Emission max. = 486nm