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Sequential Filtration: A Gentle Method for the Isolation of Functional Extracellular Vesicles.
A prevalent challenge in isolating extracellular vesicles (EVs) from biological fluids is the reliable depletion of abundant contaminants-including free proteins and biomolecules, as well as nontarget vesicle subpopulations and other nanoparticulates-from the sample matrix while maximizing recovery. Sequential Filtration is a recently published approach for the size-based isolation of exosomes that is ideally suited for large-volume biofluid samples such as ascites , urine , lavage fluid, or cell-conditioned media. We describe a straightforward, three-step protocol comprising back-to-back steps of dead-end (normal) filtration, tangential-flow filtration, and track-etched membrane filtration that can be applied to yield a homogeneous population of exosome-sized extracellular vesicles. The approach is scalable and employs relatively gentle manipulation forces to fractionate and concentrate extracellular vesicles with good purity and functional integrity.
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