Enhanced sample pre-concentration by ion concentration polarization on a paraffin coated converging microfluidic paper based analytical platform.
Journal
Biomicrofluidics
ISSN: 1932-1058
Titre abrégé: Biomicrofluidics
Pays: United States
ID NLM: 101293825
Informations de publication
Date de publication:
Jan 2020
Jan 2020
Historique:
received:
28
10
2019
accepted:
23
12
2019
entrez:
15
1
2020
pubmed:
15
1
2020
medline:
15
1
2020
Statut:
epublish
Résumé
Microfluidic paper-based analytical devices (μPADs) represent a modest and feasible alternative for conventional analytical methods. However, the inadequate sensitivity of these devices limits the possible applications of μPADs. In this scenario, inducing ion concentration polarization (ICP) on μPADs has shown promise to overcome this limitation by preconcentrating the analytes of interest. Here, we report a μPAD implementing ICP using an off-shelf Nafion® membrane as the perm selective membrane. Two types of devices with a geometrical configuration of a straight channel converging at the middle connecting to circular reservoirs at the end of channels were fabricated. The devices are comprised of a single input channel and an absorption channel. The Nafion membrane is attached to the absorption channel of the device, which is encased by heating with paraffin films at both sides to lower the electro-osmotic flow generated by an applied DC electric field that is needed for ICP. The field induced ICP enables obtaining a maximum concentration factor of more than 2000 folds for fluorescein sodium salt solution on the μPAD. Also, since evaporation of the sample solution was reported to be of great influence on the concentration factor, we analyze the effect of sample solution evaporation on sample preconcentration. Furthermore, our reported fabrication method for μPAD can lower the fabrication cost down to 0.3 USD. This device shows the potential to be developed for serving as a diagnostic and environmental monitoring platform.
Identifiants
pubmed: 31933713
doi: 10.1063/1.5133946
pii: 1.5133946
pmc: PMC6941944
doi:
Types de publication
Journal Article
Langues
eng
Pagination
014103Informations de copyright
Copyright © 2020 Author(s).
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