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Related Experiment Video

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Paper-Based Preconcentration and Isolation of Microvesicles and Exosomes
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Origami paper-based sample preconcentration using sequentially driven ion concentration polarization.

Junwoo Lee1, Yong Kyoung Yoo, Dohwan Lee

  • 1Department of Electrical Engineering, Kwangwoon University, 20 Kwangwoon-ro, Nowon, Seoul 01897, South Korea. dhur@kw.ac.kr jhlee@kw.ac.kr.

Lab on a Chip
|January 28, 2021
PubMed
Summary
This summary is machine-generated.

A new sequentially driven ion concentration polarization (ICP) method improves preconcentration efficiency in complex samples like human serum. This technique enhances electrokinetic forces for stable and efficient enrichment, boosting diagnostic assay sensitivity.

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Microfluidics

Background:

  • Ion concentration polarization (ICP) is a preconcentration technique with high potential.
  • ICP faces challenges with instability and low efficiency in physiological conditions due to high ionic strength and biomolecules.

Purpose of the Study:

  • To develop a sequentially driven ICP process for enhanced preconcentration in complex biological samples.
  • To overcome the limitations of traditional ICP in high ionic strength environments.

Main Methods:

  • Implementation of a three-dimensional sequential ICP (3D seq-ICP) using a paper-based origami structure.
  • Utilizing enhanced electrokinetic forces for preconcentration without increasing the electric field.

Main Results:

  • Achieved a 13-fold preconcentration factor (PF) in human serum using the 3D seq-ICP method.
  • Demonstrated a paper-based enzyme-linked immunosorbent assay (ELISA) with a 6-fold increase in signal for tau protein detection.

Conclusions:

  • The 3D seq-ICP method offers a stable and efficient approach for preconcentrating analytes in complex biological matrices.
  • This technique significantly enhances the sensitivity of paper-based diagnostic assays, showing promise for point-of-care applications.