Microfluidic Approaches for Affinity-Based Exosome Separation.

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Exosomes, a type of extracellular vesicle (EV), show significant potential in diagnostics and theranostics.
• Liquid biopsy enables exosome extraction from body fluids for non-invasive point-of-care (POC) applications.
• Exosome separation is challenged by similar impurities, heterogeneity, and biofouling.

Purpose of the Study:

• To present state-of-the-art exosome separation methods.
• To explore the development of novel separation techniques.
• To focus on microfluidic devices for affinity-based exosome separation.

Main Methods:

• Review of current exosome separation technologies.
• Design and fabrication of microfluidic devices for affinity separation.
• Investigation of manufacturing methods like laminating, replica molding, and 3D printing.
• Optimization of microfluidic flow routes and patterns to enhance purification.

Main Results:

• Microfluidic devices offer compactness and rapid analysis for POC applications.
• Low-cost, cleanroom-free manufacturing methods are presented for microfluidic devices.
• Enhanced flow designs improve contact surfaces and residence time for better affinity purification.
• Methods for evaluating exosome separation efficiency are discussed.

Conclusions:

• Microfluidic affinity separation presents a viable strategy for efficient exosome isolation.
• The review provides a comprehensive guide for developing new microfluidic devices for exosome separation.
• These advancements support the development of accessible and reliable diagnostic tools.