Han, Sung Il Hwang, Kyo Seon Kwak, Rhokyun Lee, Jeong Hoon 2024-01-20T04:03:33Z 2024-01-20T04:03:33Z 2021-09-03 2016-06 1473-0197 https://pubs.kist.re.kr/handle/201004/124038 Microfluidic paper-based analytical devices (mu PADs) for molecular detection have great potential in the field of point-of-care diagnostics. Currently, a critical problem being faced by mu PADs is improving their detection sensitivity. Various preconcentration processes have been developed, but they still have complicated structures and fabrication processes to integrate into mu PADs. 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. English Royal Society of Chemistry DEVICES ASSAY SEPARATION SAMPLE SENSITIVITY TRANSPORT MEMBRANES Microfluidic paper-based biomolecule preconcentrator based on ion concentration polarization Article 10.1039/c6lc00499g 1 Lab on a Chip, v.16, no.12, pp.2219 - 2227 Lab on a Chip 16 12 2219 2227 scie scopus 000378944800007 2-s2.0-84973596314 Biochemical Research Methods Chemistry, Multidisciplinary Chemistry, Analytical Nanoscience & Nanotechnology Instruments & Instrumentation Biochemistry & Molecular Biology Chemistry Science & Technology - Other Topics Instruments & Instrumentation Article DEVICES ASSAY SEPARATION SAMPLE SENSITIVITY TRANSPORT MEMBRANES