Extracellular vesicles (EVs) are nanoscale membrane-bound particles released by cells, carrying a diverse cargo of proteins, lipids, and nucleic acids that mediate intercellular communication. Their presence in bodily fluids such as blood, urine, and cerebrospinal fluid makes them promising candidates for non-invasive diagnostics and therapeutic delivery systems. However, the successful isolation and purification of EVs remain challenging due to their small size, low abundance, and high heterogeneity. Traditional methods like ultracentrifugation often result in poor recovery, sample degradation, or co-isolation of contaminants, limiting their reproducibility and clinical utility.
This study presents an optimized protocol based on aqueous two-phase systems (ATPS) for the high-yield isolation of EVs from complex biological matrices.CD74 Antibody Purity & Documentation ATPS exploits the immiscibility of two polymer-rich aqueous phases—typically poly(ethylene glycol) (PEG) and dextran (DEX)—to separate target molecules through partitioning behavior. In this system, EVs preferentially accumulate in the dextran-rich phase due to their surface properties and hydrophobic interactions, while soluble proteins, cellular debris, and other impurities are excluded or enriched in the PEG phase. The process is gentle, scalable, and operates under physiological conditions, minimizing structural damage to sensitive biomolecules.
The method was tested using HEK 293 cell-derived EVs, which were isolated from culture medium via ATPS with a final DEX concentration of 1.3% w/w and PEG at 4.5% w/w. After phase separation, the lower DEX phase containing EVs was collected, and the upper PEG phase was discarded. Repeated phase exchanges were performed to enhance purity, with each cycle effectively diluting residual contaminants. The resulting EV fraction showed a significant increase in particle-to-protein ratio, indicating effective removal of non-EV material. Nanoparticle tracking analysis confirmed a recovery rate exceeding 90%, far surpassing the ~25% typically achieved with ultracentrifugation.
To validate functional integrity, isolated EVs were subjected to proteomic and RNA profiling. Mass spectrometry analysis revealed enrichment of canonical EV markers such as CD63, TSG101, and Flotillin-1, while abundant serum proteins like albumin and immunoglobulins were markedly reduced. Furthermore, reverse transcription PCR demonstrated intact mRNA and miRNA profiles, confirming that the ATPS process did not degrade nucleic acid content. Notably, the method successfully isolated EVs from urine samples, enabling detection of prostate-specific biomarkers associated with cancer progression.PDGFR-β Antibody In Vitro
A critical advantage of this approach lies in its compatibility with downstream applications.PMID:35120587 Unlike ultracentrifugation, which requires extensive washing steps that risk EV aggregation and loss, ATPS allows direct use of the purified EV fraction in assays such as flow cytometry, western blotting, and live-cell uptake studies. The entire isolation process takes less than one hour, making it highly suitable for high-throughput screening and point-of-care diagnostics.
Moreover, the ATPS system is adaptable: by tuning the concentrations of PEG and DEX, researchers can adjust the partition coefficient to target specific EV subpopulations based on size, density, or surface charge. This tunability enables selective enrichment of distinct EV subsets, enhancing the resolution of molecular profiling experiments.
In summary, ATPS-based EV isolation offers a rapid, efficient, and scalable alternative to conventional techniques. Its ability to achieve high recovery rates, maintain biomolecular integrity, and preserve functional activity positions it as a transformative tool in extracellular vesicle research. With further refinement and integration into automated platforms, this method holds strong potential for routine clinical use in liquid biopsy and personalized medicine.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com