Integration of Multiplexed Microfluidic Electrokinetic Concentrators with a Morpholino Microarray via Reversible...

Area of Science:

• Biotechnology
• Microfluidics
• Analytical Chemistry

Background:

• Surface hybridization reactions between DNA and morpholinos (MOs) are crucial for enhanced detection but can be slow.
• Conventional methods rely on diffusion-based hybridization, limiting detection speed and sensitivity.

Purpose of the Study:

• To develop a microfluidic concentration device to accelerate DNA-morpholino (MO) hybridization for improved detection.
• To demonstrate the device's effectiveness in concentrating DNA and enhancing hybridization efficiency.

Main Methods:

• Fabrication of a polydimethylsiloxane (PDMS) microchannel with a printed ion-selective layer of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS).
• Reversible surface bonding of the microfluidic concentrator to a morpholino microarray for electrokinetic trapping and hybridization.
• Development and testing of a multiplexed device with 5 parallel concentrators.

Main Results:

• Achieved a maximum DNA concentration factor of ~800 and a limit of detection of 10 nM within 15 minutes.
• Demonstrated a 10-fold increase in hybridization speed compared to conventional diffusion-based methods.
• Successfully demonstrated multiplexing with 5 parallel concentrators, maintaining high efficiency.

Conclusions:

• The microfluidic concentrator significantly accelerates hybridization, enabling faster and more sensitive DNA detection.
• The decoupled fabrication approach simplifies integration with various microarray platforms and facilitates multiplexing.
• This technology holds promise for developing highly multiplexed, concentrator-enhanced microarray detection systems for genetic analysis and diagnostics.