Journal
ELECTROPHORESIS
Volume 39, Issue 15, Pages 2029-2038Publisher
WILEY
DOI: 10.1002/elps.201700491
Keywords
Exosomes; Ion concentration polarization; Microfluidics
Funding
- NIH [1R21AI105361-01A1, 1R21CA206904-01, HG009010-01]
- NATIONAL CANCER INSTITUTE [R21CA206904] Funding Source: NIH RePORTER
- NATIONAL HUMAN GENOME RESEARCH INSTITUTE [R21HG009010] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R21AI105361] Funding Source: NIH RePORTER
Ask authors/readers for more resources
Exosomes carry microRNA biomarkers, occur in higher abundance in cancerous patients than in healthy ones, and because they are present in most biofluids, including blood and urine, these can be obtained noninvasively. Standard laboratory techniques to isolate exosomes are expensive, time consuming, provide poor purity, and recover on the order of 25% of the available exosomes. We present a new microfluidic technique to simultaneously isolate exosomes and preconcentrate them by electrophoresis using a high transverse local electric field generated by ion-depleting ion-selective membrane. We use pressure-driven flow to deliver an exosome sample to a microfluidic chip such that the transverse electric field forces them out of the cross flow and into an agarose gel which filters out unwanted cellular debris while the ion-selective membrane concentrates the exosomes through an enrichment effect. We efficiently isolated exosomes from 1x PBS buffer, cell culture media, and blood serum. Using flow rates from 150 to 200L/h and field strengths of 100V/cm, we consistently captured between 60 and 80% of exosomes from buffer, cell culture media, and blood serum as confirmed by both fluorescence spectroscopy and nanoparticle tracking analysis. Our microfluidic chip maintained this recovery rate for more than 20min with a concentration factor of 15 for 10min of isolation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available