A standardized method for plasma extracellular vesicle isolation and size distribution analysis.

Area of Science:

• Biochemistry
• Nanotechnology
• Clinical Diagnostics

Background:

• Extracellular vesicles (EVs) show promise for diagnostics and therapeutics.
• Current methods for EV data collection lack standardization, hindering clinical application.
• Limited sample volume often restricts comprehensive EV analysis.

Purpose of the Study:

• To establish a standardized, reproducible workflow for plasma extracellular vesicle (EV) isolation and quantification.
• To maximize the scientific value of limited biological specimens.
• To enable absolute quantification of EV concentration and size distribution.

Main Methods:

• Automated size exclusion chromatography for EV isolation.
• Tunable resistive pulse sensing for EV quantification.
• Minimizing variations in EV processing, handling, and storage for reproducibility.

Main Results:

• The protocol allows for efficient recovery of physiologically intact EVs.
• Absolute quantification of EV concentration and size distribution is achieved.
• The workflow is scalable and optimizes reproducibility.

Conclusions:

• This standardized protocol offers a scalable solution for EV analysis.
• Absolute quantification provides a novel method for standardizing downstream EV applications.
• The method supports the clinical translation of EVs by ensuring reliable data collection.