Streptavidin MagPoly beads are ideal for purification of biotinylated proteins and nucleic acids, here is primarily intended for isolation of human exosome subpopulations and flow cytometry analysis from cell culture media or urine. This product can be also used to prepare exosome subpopulations for western blot, electron microscopy and qRT-PCR etc.. Streptavidin MagPoly beads are uniform, superparamagnetic polystyrene beads (1.0um diameter) coated with streptavidin. The beads need to be coated with your exosome specific antibody (biotinylated) prior to use. The antibody coupled beads are directly incubated with samples and captured exosomes are magnetically separated for downstream applications.