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Updated: Jul 15, 2025

Rapid Fluorescence-based Characterization of Single Extracellular Vesicles in Human Blood with Nanoparticle-tracking Analysis

Rapid Fluorescence-based Characterization of Single Extracellular Vesicles in Human Blood with Nanoparticle-tracking Analysis

Published on: January 7, 2019

Extracellular Vesicle Refractive Index Derivation Utilizing Orthogonal Characterization.

Michelle L Pleet¹, Sean Cook², Vera A Tang³

¹Viral Immunology Section, Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, United States.

|October 3, 2023

Summary

This summary is machine-generated.

Accurate measurement of small particles like viruses requires knowing their refractive index. This study presents two accessible methods to quantify nanoparticle refractive index using common instruments and Mie theory.

Keywords:

calibration extracellular vesicles light scatter refractive index viruses

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Characterizing Extracellular Vesicles from Biological Fluids

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Published on: February 28, 2025

Area of Science:

Biophysics
Nanotechnology
Optical Physics

Background:

Detection of small particles (extracellular vesicles, viruses) relies on light scattering.
Current methods like flow cytometry lack standardized refractive index measurements.
Accurate refractive index is crucial for particle characterization and detection limits.

Purpose of the Study:

To develop accessible methods for measuring nanoparticle refractive index.
To enable orthogonal comparisons between different particle detection platforms.
To provide a quantifiable limit of detection for small particle analysis.

Main Methods:

Demonstrated two methods for deriving nanoparticle refractive index.
Utilized orthogonal measurements with commercially available platforms.
Applied Mie theory integrating particle diameter and scattering cross-section.

Main Results:

Successfully derived small particle refractive index at single-particle and population levels.
Provided a pathway to standardize nanoparticle measurements.
Enabled calculation of refractive index using accessible techniques.

Conclusions:

Developed accessible methods for quantifying nanoparticle refractive index.
These techniques facilitate accurate characterization of small particles.
Standardized measurements improve comparability across detection platforms.