Streptavidin Super Mag (50 nm) are streptavidin conjugated magnetic beads with average particle size of 50 nm. The monolayer of streptavidin that is covalently coupled to their surface makes most of the biotin binding sites sterically available for binding of biotinylated nucleic acids, antibodies, or other biotinylated ligands and targets. With large surface area, excellent colloidal stability and unique surface coating, Streptavidin Super Mag (50 nm) exhibit high binding capacity, low non-specific binding and fast magnetic separation.