Hybrid microfluidic platform for multifactorial analysis based on electrical impedance, refractometry, optical absorption and fluorescence

F.M. Pereira, Iwona Bernacka-Wojcik, R.S.R. Ribeiro, Maria Teresa Lobato, E. Fortunato, Rodrigo Ferrão de Paiva Martins, R. Igreja, Pedro A S Jorge, H. Águas, A.M.G. Oliva

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1 Citation (Scopus)
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Abstract

This paper describes the development of a novel microfluidic platform for multifactorial analysis integrating four label-free detection methods: electrical impedance, refractometry, optical absorption and fluorescence. We present the rationale for the design and the details of the microfabrication of this multifactorial hybrid microfluidic chip. The structure of the platform consists of a three-dimensionally patterned polydimethylsiloxane top part attached to a bottom SU-8 epoxy-based negative photoresist part, where microelectrodes and optical fibers are incorporated to enable impedance and optical analysis. As a proof of concept, the chip functions have been tested and explored, enabling a diversity of applications: (i) impedance-based identification of the size of micro beads, as well as counting and distinguishing of erythrocytes by their volume or membrane properties; (ii) simultaneous determination of the refractive index and optical absorption properties of solutions; and (iii) fluorescence-based bead counting
Original languageEnglish
Article number181
JournalMicromachines
Volume7
Issue number10
DOIs
Publication statusPublished - 7 Oct 2016

Keywords

  • single cell analysis
  • label-free methods
  • impedance spectroscopy
  • refractometry
  • optical absorption
  • hybrid microfluidic chip

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