Biological Medicine
Exosomes are small membrane vesicles containing complex RNA and proteins, with diameters ranging from approximately 30 to 150 nm. Exosomes are widely present in cell culture supernatants and various bodily fluids, and can originate from both animal and plant cells. Exosomes are capable of delivering a variety of bioactive substances—including DNA, RNA, miRNA, lipids, and proteins—to recipient cells, while protecting their encapsulated contents from degradation and denaturation caused by nucleases, proteases, and changes in the external environment.
Exosomes hold tremendous potential for application. They contain molecules that promote cell proliferation and differentiation, making them promising for use in tissue repair and regenerative medicine, such as in tissue engineering and stem cell therapy. In diagnostics and monitoring, molecular markers contained in exosomes may be used for disease diagnosis and surveillance—for example, early disease detection through specific RNAs or proteins in blood-derived exosomes. In the field of aesthetics, exosomes offer benefits such as anti-aging, repair of damaged skin barriers, anti-inflammatory effects, skin brightening, improvement of enlarged pores, and enhanced skin hydration.
Traditional exosome extraction methods mainly include the following:
Ultracentrifugation. This is the most commonly used method for exosome extraction. It yields a relatively large quantity of exosomes, but purity is insufficient, and exosome aggregation is often observed under electron microscopy.
Filtration centrifugation. This method is simple to operate and does not affect the biological activity of exosomes, but it also suffers from insufficient purity and low efficiency.
Density gradient centrifugation. Exosomes isolated by this method have high purity, but the preparatory work is cumbersome and time-consuming, resulting in low processing efficiency.
Immunomagnetic bead method. This method preserves the intact morphology of exosomes, offers high specificity, is simple to operate, and does not require expensive instrumentation. However, the extraction process may affect the biological activity of exosomes, limiting their subsequent research and application.
Chromatography. Exosomes isolated by this method show uniform size under electron microscopy, but it requires specialized purification equipment, representing a significant capital investment.
Microfluidic separation. This method separates exosomes through mechanical principles such as negative pressure and oscillation, achieving greatly improved yield and purity. However, it requires specific equipment and is not suitable for large-scale production.
Based on years of experience in membrane separation technology applications, Guochu Technology (Xiamen) Co., Ltd. has developed a membrane filtration technology suitable for exosome purification and concentration. This membrane filtration approach not only yields exosomes of relatively high purity but also preserves their activity, achieves high efficiency, and can meet the demands of large-scale production.
Membrane filtration is a physical separation process that utilizes the selective permeability of membrane pores for separation and purification. In exosome extraction and purification, the process flow is as follows:
Through the purification membrane module, macromolecules and large-particle-size substances are retained, allowing exosomes to pass through, thereby achieving preliminary purification of exosomes. The filtered exosome solution is then introduced into the concentration membrane module. The concentration membrane module not only increases the exosome concentration but also allows small-molecule impurities to permeate, ultimately yielding a purified and enriched exosome solution.
The advantages of membrane technology are as follows:
Compact equipment footprint;
Simple operation and easy maintenance;
Physical process that preserves exosome structure and activity;
High retention precision, effectively intercepting large particle size impurities;
No chemical reagents required, with no detrimental effects on the product;
Filtration carried out in a closed system, enabling clean production;
Modular design, facilitating mobility, expansion, and system upgrades.
Since its establishment, Guochu Technology (Xiamen) Co., Ltd. has been committed to membrane separation technology as its core, dedicated to promoting novel separation technologies. The company continuously explores new applications of advanced membrane separation technologies in fields such as power, chemicals, biopharmaceuticals, microelectronics, metallurgy, machinery, food, dairy, beverages, and the environment. By addressing the highly differentiated needs of various clients, Guochu Technology provides targeted integrated solutions for filtration and purification, improving product quality and meeting customer requirements.
