Simultaneous isolation and preconcentration of exosomes by ion concentration polarization

Electrophoresis
Steven MarczakHsueh-Chia Chang

Abstract

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 1× PBS buffer, cell culture media, and blood serum. Using flow rates from 150 to 200 μL/h and field strengths of 100 V/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 anal...Continue Reading

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Citations

May 26, 2020·Critical Reviews in Analytical Chemistry·Marwa A A Ragab, Eman I El-Kimary
Aug 29, 2018·Journal of Extracellular Vesicles·Shang-Chun GuoHelen Dawn
Dec 15, 2020·Journal of Chromatography. a·Thanaporn LiangsupreeMarja-Liisa Riekkola
Sep 12, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Andriy YaroshchukMerlin L Bruening
Nov 9, 2019·Analytical Chemistry·Courtney J KristoffLisa A Holland
Nov 2, 2021·ACS Nano·Sara Hassanpour TamrinArindom Sen
Oct 31, 2021·Electrophoresis·Gladys G Diaz-ArmasVictor H Perez-Gonzalez

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