Amine-Modified Diatomaceous Earth Syringe Platform (DeSEI) for Efficient and Cost-Effective EV Isolation

Area of Science:

• Biotechnology
• Nanotechnology
• Biochemistry

Background:

• Conventional extracellular vesicle (EV) isolation methods are time-consuming, yield low purity, and require specialized equipment.
• Existing techniques hinder rapid analysis and point-of-care applications for EVs.

Purpose of the Study:

• To develop a novel, rapid, and cost-effective platform for extracellular vesicle (EV) isolation.
• To enhance the efficiency of EV recovery and downstream molecular analysis, particularly miRNA extraction.

Main Methods:

• Development of the DeSEI (amine-functionalized Diatomaceous earth-based Syringe platform for EV Isolation) using amine-functionalized diatomaceous earth (ADe) in a syringe-filter system.
• Utilizing electrostatic interactions between positively charged ADe and negatively charged EVs for capture.
• Optimization of a 30-minute isolation protocol.

Main Results:

• The DeSEI platform achieved rapid (30 min) isolation of intact EVs with comparable morphology, size, and protein markers to ultracentrifugation.
• Demonstrated nearly 60-fold higher recovery efficiency for EV-derived miRNA compared to ultracentrifugation.
• Showcased versatility with a one-step miRNA extraction protocol and a user-friendly cartridge format.

Conclusions:

• The DeSEI platform provides a fast, simple, and equipment-independent alternative for EV isolation.
• The direct miRNA extraction capability streamlines biomarker analysis, paving the way for point-of-care diagnostic tools.
• DeSEI offers significant advantages for EV-based research and diagnostics.