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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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Hybrid Microfluidic Platform for Multifactorial Analysis Based on Electrical Impedance, Refractometry, Optical

Fábio M Pereira1,2, Iwona Bernacka-Wojcik3, Rita S Rodrigues Ribeiro4,5

  • 1CENIMAT/I3N, Department of Materials Science, Faculty of Science and Technology, New University of Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal. fmrp89@hotmail.com.

Micromachines
|November 9, 2018
PubMed
Summary

This study introduces a novel microfluidic chip for multifactorial analysis, integrating four label-free detection methods. The platform enables diverse applications including cell analysis and solution property determination.

Keywords:
hybrid microfluidic chipimpedance spectroscopylabel-free methodsoptical absorptionrefractometrysingle cell analysis

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Microfluidics

Background:

  • Multifactorial analysis requires integrating multiple detection techniques.
  • Label-free detection methods offer advantages in biological and chemical analysis.
  • Microfluidic platforms provide miniaturized solutions for complex analyses.

Purpose of the Study:

  • To develop and fabricate a novel hybrid microfluidic platform for multifactorial analysis.
  • To integrate four label-free detection methods: electrical impedance, refractometry, optical absorption, and fluorescence.
  • To demonstrate the platform's capabilities for diverse analytical applications.

Main Methods:

  • Design and microfabrication of a hybrid microfluidic chip using polydimethylsiloxane (PDMS) and SU-8 photoresist.
  • Incorporation of microelectrodes and optical fibers for integrated detection.
  • Utilizing electrical impedance, refractometry, optical absorption, and fluorescence for analysis.

Main Results:

  • Successful fabrication of a multifactorial hybrid microfluidic chip.
  • Demonstrated impedance-based identification and counting of micro beads and erythrocytes.
  • Achieved simultaneous determination of solution refractive index and optical absorption.
  • Validated fluorescence-based bead counting.

Conclusions:

  • The developed microfluidic platform effectively integrates multiple label-free detection methods.
  • The platform shows significant potential for diverse applications in cell analysis and solution characterization.
  • This hybrid approach offers a versatile tool for advanced analytical tasks.