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Issue 12, 2016
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Microfluidic paper-based biomolecule preconcentrator based on ion concentration polarization

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Abstract

Microfluidic paper-based analytical devices (μPADs) for molecular detection have great potential in the field of point-of-care diagnostics. Currently, a critical problem being faced by μPADs is improving their detection sensitivity. Various preconcentration processes have been developed, but they still have complicated structures and fabrication processes to integrate into μPADs. To address this issue, we have developed a novel paper-based preconcentrator utilizing ion concentration polarization (ICP) with minimal addition on lateral-flow paper. The cation selective membrane (i.e., Nafion) is patterned on adhesive tape, and this tape is then attached to paper-based channels. When an electric field is applied across the Nafion, ICP is initiated to preconcentrate the biomolecules in the paper channel. Departing from previous paper-based preconcentrators, we maintain steady lateral fluid flow with the separated Nafion layer; as a result, fluorescent dyes and proteins (FITC–albumin and bovine serum albumin) are continuously delivered to the preconcentration zone, achieving high preconcentration performance up to 1000-fold. In addition, we demonstrate that the Nafion-patterned tape can be integrated with various geometries (multiplexed preconcentrator) and platforms (string and polymer microfluidic channel). This work would facilitate integration of various ICP devices, including preconcentrators, pH/concentration modulators, and micro mixers, with steady lateral flows in paper-based platforms.

Graphical abstract: Microfluidic paper-based biomolecule preconcentrator based on ion concentration polarization

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Supplementary files

Article information


Submitted
14 Apr 2016
Accepted
05 May 2016
First published
05 May 2016

Lab Chip, 2016,16, 2219-2227
Article type
Paper

Microfluidic paper-based biomolecule preconcentrator based on ion concentration polarization

S. I. Han, K. S. Hwang, R. Kwak and J. H. Lee, Lab Chip, 2016, 16, 2219
DOI: 10.1039/C6LC00499G

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