Carboxyl Fluorescent Particles, Nile Red, 0.5%w/v, 15.0-19.0µm, 2mL

These large polystyrene microspheres are internally labeled with Nile Red, a lipophilic fluorescent dye (excitation ~552 nm, emission ~636 nm), providing strong red fluorescence. With a size range of 15.0–19.0 µm and a carboxyl-functionalized surface, they are suitable for covalent coupling of proteins, antibodies, or other biomolecules via EDC/NHS chemistry. Supplied at 0.5% w/v in a 2 mL aqueous suspension, these beads are ideal for use in imaging studies, microfluidic systems, and particle-based assay development where both size visibility and fluorescent tracking are critical.