Exosomes are small vesicles (30–120 nm) containing RNA and protein that are secreted by various types of cells in culture, and found in abundance in body fluids, such as blood, saliva, urine, and breast milk. Exosomes were reported to function as intercellular messengers, delivering their cargo of effector or signaling macromolecules between specific cells; however, their formation, the makeup of the cargo, and biological pathways in which they are involved remain unclear.

The biological & medical study of exosome function and trafficking requires the isolation of intact exosomes, but the current methods used are tedious and difficult. The EZBioscience Exosome Isolation Kit (from plasma for NTA/TEM) provides a simple and reliable method of concentrating intact exosomes from human and animal plasma samples. By tying up water molecules, the Exosome Isolation reagent forces less-soluble components (i.e. exosomes) out of solution, allowing them to be collected with a brief and relatively low-speed centrifugation. Then, the exosomes are further purified by centrifuge purification columns. The purified exosomes can be used for Nanoparticle Tracking Analysis (NTA), Transmission Electron Microscope (TEM), and co-culturing with cells.

The exosome could be isolated from the plasma within 4 hours by using this Kit.