Rapid, High-Yield Cleanup for Nanoparticle Analysis Vesi-SEC micro spin-columns offer rapid and efficient cleanup for extracellular vesicle (EV) and bio-nanoparticle samples post-labeling. Powered by a proprietary centrifugal size exclusion chromatography (SEC) stationary phase, these columns remove excess fluorescent dyes and antibodies in just one minute, dramatically increasing assay sensitivity and data reliability without significant sample loss or dilution.