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Centrifugation

Centrifugation

Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...

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High-throughput, Automated Extraction of DNA and RNA from Clinical Samples using TruTip Technology on Common Liquid Handling Robots

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Magnetophoresis in Centrifugal Microfluidics at Continuous Rotation for Nucleic Acid Extraction.

Sebastian Hin¹, Nils Paust^1,2, Markus Rombach¹

¹Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany.

|December 23, 2022

Summary

We developed magnetophoresis under continuous rotation for automated nucleic acid extraction on centrifugal microfluidic platforms. This method enables efficient magnetic bead-based extraction at the point-of-need.

Keywords:

centrifugal microfluidics magnetophoresis nucleic acid extraction

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Area of Science:

Biotechnology
Molecular Diagnostics
Microfluidics

Background:

Centrifugal microfluidics offers automated molecular diagnostics but struggles with integrated nucleic acid extraction.
Solid-phase nucleic acid extraction using magnetic beads is a common method but requires efficient integration into microfluidic systems.

Purpose of the Study:

To develop and validate a novel magnetophoresis technique for magnetic bead-based nucleic acid extraction within a continuously rotating centrifugal microfluidic system.
To demonstrate the feasibility of integrating automated nucleic acid extraction into point-of-need diagnostic devices.

Main Methods:

Developed a magnetophoresis system using four stationary permanent magnets above a rotating cartridge to guide magnetic beads.
Utilized continuous rotation and centrifugal forces to control bead movement and liquid handling within microfluidic chambers.
Tested bead transfer in liquids with varying surface tension and density, and performed nucleic acid extraction from lysed *Anopheles gambiae* mosquitoes.

Main Results:

Magnetic bead movement was controlled radially inwards below 5 Hz rotation frequency.
Bead inertia and cartridge geometry effectively controlled azimuthal movement between chambers.
Nucleic acid extraction from mosquitoes yielded eluate purity (A260/A280 = 1.6 ± 0.04) comparable to reference methods.
Extracted RNA enabled successful RT-PCR with Ct values (17.9 ± 1.6) close to reference results (19.3 ± 1.7).

Conclusions:

Magnetophoresis under continuous rotation is a viable method for integrating magnetic bead-based nucleic acid extraction into centrifugal microfluidic cartridges.
This approach facilitates automated, high-yield, and high-purity nucleic acid extraction at the point-of-need.
The developed system shows promise for advancing automated molecular diagnostics.