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A Modified Precipitation Method to Isolate Urinary Exosomes
Published on: January 16, 2015
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Urinary Exosome Isolation and Enrichment as Enabling Liquid Biopsy by Biologically Intact Exosome Separation
Taewoon Kim1,2, Wonseok Kim3,4, Sung Jae Kim3,5,6,7
1Department of Bionanotechnology, Graduate School, Hanyang University, Seoul 04763, Republic of Korea.
Nano Letters
|November 10, 2025
Summary
This study introduces a microfluidic method for isolating intact exosomes from urine, significantly improving biomarker detection sensitivity for noninvasive disease diagnostics. This technique enhances PCR and Western blotting sensitivity for earlier and more accurate molecular diagnostics.
Area of Science:
- Biomarker Discovery
- Microfluidics
- Molecular Diagnostics
Background:
- Urine-based liquid biopsies and exosomes are promising noninvasive tools for disease biomarker detection.
- Current exosome isolation methods from diluted urine lack sensitivity due to insufficient recovery of intact exosomes.
Purpose of the Study:
- To develop a highly sensitive method for detecting exosome markers using microfluidics-based biologically intact exosome separation technology (BEST).
- To isolate and enrich exosomes from human urine for enhanced biomarker analysis.
Main Methods:
- Utilized microfluidics-based BEST to separate exosomes from human urine.
- Employed hydrodynamic wall repulsion and suction-driven drag forces for particle segregation.
- Validated separation purity and efficiency through numerical simulations and experimental analysis.
Main Results:
- Achieved segregation of 100 nm exosomes from larger particles with high purity.
- Demonstrated a separation purity of 72.4% for urinary exosomes at a specific flow rate.
- Concentrated exosomes led to 4.7-fold and 4.0-fold increases in PCR and Western blotting sensitivity, respectively.
Conclusions:
- The BEST method significantly enhances the sensitivity of exosome marker detection from human urine.
- This microfluidic technology holds considerable potential for advancing molecular diagnostics through improved noninvasive biomarker analysis.
- The developed technique addresses the limitations of current exosome isolation methods, paving the way for more sensitive disease detection.
