DiagPoly™ Plain Fluorescent Polystyrene Particles, Red, 500 nm are monodispersed fluorescent polystyrene beads(PDI < 0.08, likely around 0.03) using rhodamine B (CAS # 81-88-9, Ex/Em=552/582 nm). Ex/Em=552/578 nm. Supplied 1ml at 1% solid dispersed in 0.1% Tween 20 in DI water containing 2mM NaN3.

DiagPoly™ Carboxyl Fluorescent Polystyrene Particles, Red, 2 μm (# DCFR-L111) are encapsulated with red fluorophores (excitation: 545 nm, emission: 566 nm) and functionalized with carboxyl groups (COOH) on the surface for the covalent attachment of proteins, peptides and nucleic acids. The density of liquid suspension is 1.05-1.06 g/mL. Sonicate/Vortex the microspheres before each use.