... Beads are composed of hydrophilic, cross-linked, chemical polymers. Our Streptavidin Magnetic Beads are composed of hydrophilic, cross-linked, chemical polymers. The beads respond ... , enables the magnetic separation and purification of almost any biotin-linked target molecule.Application examples:Immunoprecipitation / ImmunodetectionIsolation of proteins,Ă‚ nucleic acids ...