A continuous flow microfluidic device based on contactless dielectrophoresis for bioparticles enrichment

Area of Science:

• Microfluidics
• Biotechnology
• Electrical Engineering

Background:

• Dielectrophoresis (DEP) platforms are effective for separating cells and bioparticles based on size and electrical properties.
• Traditional methods can be costly and complex, necessitating development of more accessible techniques.

Purpose of the Study:

• To develop and evaluate a novel, low-cost microfluidic device for particle enrichment using dielectrophoresis.
• To optimize the device's performance by analyzing key operational parameters.

Main Methods:

• Fabrication of a microfluidic device with a unique electrode pattern using a chemical deposition method.
• Experimental enrichment of yeast, Escherichia coli, and latex particles.
• Spectrophotometric analysis to assess device performance and response surface methodology (RSM) for parameter optimization.

Main Results:

• The microfluidic device successfully enriched yeast, E. coli, and latex particles.
• Applied voltage amplitude, frequency, and flow rate significantly impacted enrichment efficiency.
• RSM yielded a predictive model, identifying optimal parameters for maximum performance.

Conclusions:

• The developed dielectrophoresis-based microfluidic device offers a cost-effective and accurate method for particle separation.
• Optimized parameters led to high experimental enrichment efficiencies: 87 ± 2% (yeast), 82 ± 4% (E. coli), and 86 ± 3% (latex particles).
• The technology shows promise for enriching both biological and polymeric particles.