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Pseudo forces, or fictitious forces, appear to act on an object in motion in a rotating frame of reference with respect to an inertial reference frame. These forces are not real forces but rather mathematical constructs and are introduced to simplify calculations in a non-inertial frame while using Newton's laws of motion. Common examples of pseudo forces include centrifugal, Coriolis, and Euler forces. These forces are essential in fields such as mechanics, astrophysics, and fluid...
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Elastic reversible valves on centrifugal microfluidic platforms.

Mohammad Mahdi Aeinehvand1, Laura Weber, Martín Jiménez

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New elastic reversible valves enable automated bioanalytical assays on centrifugal microfluidic discs. These valves offer controlled liquid handling for applications like point-of-care protein detection.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Analytical Chemistry

Background:

  • Centrifugal microfluidic platforms are crucial for automating bioanalytical assays.
  • Reversible valves are essential for multi-step assays within a single reaction chamber.

Purpose of the Study:

  • To develop and characterize novel fixed elastic reversible (FER) and tunable elastic reversible (TER) valves for centrifugal microfluidic platforms.
  • To demonstrate the application of these valves in an automated point-of-care diagnostic assay.

Main Methods:

  • Fabrication and implementation of FER and TER valves with adjustable sealing pressures.
  • Mathematical modeling and experimental validation of valve behavior under centrifugal forces.
  • Development of a microfluidic disc integrating TER valves and peptide microarrays for multiplexed protein detection.

Main Results:

  • FER valves allow pre-set sealing pressures determined during fabrication.
  • TER valves enable dynamic control of sealing pressure and liquid transfer volume via a screw mechanism.
  • The developed microfluidic disc successfully performed automated multiplexed detection of five proteins from a single serum sample.

Conclusions:

  • FER and TER valves provide reliable and controllable fluid handling in centrifugal microfluidics.
  • These valves are suitable for automating complex bioanalytical workflows, including point-of-care diagnostics.
  • The developed system demonstrates a significant advancement in automated sample-to-answer solutions.