MagSi-STA magnetic silica beads coated with streptavidin efficiently bind to biotinylated molecules and are suitable for many applications based on the strong Streptavidin-Biotin interaction. They are particularly useful as a solid support phase in immunoassays. MagSi-STA beads are available with different bead sizes, streptavidin coupling chemistries, and binding capacities, so you can select the ideal beads for your application.