Hybrid electrokinetic manipulation in high-conductivity media

Jian Gao, Mandy L Y Sin, Tingting Liu, Vincent Gau, Joseph C. Liao, Pak Kin Wong

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

This study reports a hybrid electrokinetic technique for label-free manipulation of pathogenic bacteria in biological samples toward medical diagnostic applications. While most electrokinetic techniques only function in low-conductivity buffers, hybrid electrokinetics enables effective operation in high-conductivity samples, such as physiological fluids (∼1 S m -1). The hybrid electrokinetic technique combines short-range electrophoresis and dielectrophoresis, and long-range AC electrothermal flow to improve its effectiveness. The major technical hurdle of electrode instability for manipulating high conductivity samples is tackled by using a Ti-Au-Ti sandwich electrode and a 3-parallel-electrode configuration is designed for continuous isolation of bacteria. The device operates directly with biological samples including urine and buffy coats. We show that pathogenic bacteria and biowarfare agents can be concentrated for over 3 orders of magnitude using hybrid electrokinetics.

Original languageEnglish (US)
Pages (from-to)1770-1775
Number of pages6
JournalLab on a Chip - Miniaturisation for Chemistry and Biology
Volume11
Issue number10
DOIs
Publication statusPublished - May 21 2011

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ASJC Scopus subject areas

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

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