Cation-selective electropreconcentration

Il Hyung Shin, Ki Jung Kim, Jiman Kim, Hee Chan Kim, Honggu Chun

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A cation-selective microfluidic sample preconcentration system is described. The cation sample was electropreconcentrated using a reversed-direction electroosmotic flow (EOF) and an anion-permselective filter, where an electric double layer (EDL) overlap condition existed. The anion-permselective filter between microchannels was fabricated by three different methods: 1) extending a positively charged, nanoporous, polymer membrane by photopolymerization of poly(diallyldimethylammonium chloride) (PDADMAC); 2) etching a nanochannel and then coating it with a positively-charged monomer, N-[3-(trimethoxysilyl)propyl]-N′-(4- vinylbenzyl)ethylenediamine hydrochloride (TMSVE); and, 3) etching a nanochannel and then coating it with a positively-charged, pre-formed polymer, polyE-323. The EOF direction in the microchannel was reversed by both TMSVE and polyE-323 coatings. The cation-selective preconcentration was investigated using charged fluorescent dyes and tetramethylrhodamine isothiocyanate (TRITC)-tagged peptides/proteins. The preconcentration in the three different systems was compared with respect to efficiency, dependence on buffer concentration and pH, tolerable flow rate, and sample adsorption. Both TMSVE- and polyE-323-coated nanochannels showed robust preconcentration at high flow rates, whereas the PDADMAC membrane maintained anion-permselectivity at higher buffer concentrations. The TMSVE-coated nanochannels showed a more stable preconcentration process, whereas the polyE-323-coated nanochannels showed a lower peptide sample adsorption and robust efficiency under a wide range of buffer pHs. The system described here can potentially be used for the preconcentration of cationic peptides/proteins on microfluidic devices for subsequent analyses.

Original languageEnglish
Pages (from-to)1811-1815
Number of pages5
JournalLab on a Chip - Miniaturisation for Chemistry and Biology
Volume14
Issue number11
DOIs
Publication statusPublished - 2014 Jun 7

Fingerprint

Electroosmosis
Peptides
Anions
Cations
Buffers
ethylenediamine
Negative ions
Positive ions
Lab-On-A-Chip Devices
Microchannels
Microfluidics
Coatings
Adsorption
Etching
Polymers
Flow rate
Proteins
Membranes
Photopolymerization
Fluorescent Dyes

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

Cation-selective electropreconcentration. / Shin, Il Hyung; Kim, Ki Jung; Kim, Jiman; Kim, Hee Chan; Chun, Honggu.

In: Lab on a Chip - Miniaturisation for Chemistry and Biology, Vol. 14, No. 11, 07.06.2014, p. 1811-1815.

Research output: Contribution to journalArticle

Shin, Il Hyung ; Kim, Ki Jung ; Kim, Jiman ; Kim, Hee Chan ; Chun, Honggu. / Cation-selective electropreconcentration. In: Lab on a Chip - Miniaturisation for Chemistry and Biology. 2014 ; Vol. 14, No. 11. pp. 1811-1815.
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