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Summary

A novel plasmapheresis device utilizes electrothermal convective rolls for efficient plasma extraction. This point-of-care technology yields high-purity plasma suitable for sensitive biomarker detection.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Analytical Chemistry

Background:

  • Conventional plasmapheresis methods face challenges in efficiency and point-of-care application.
  • Electrothermal convective rolls in microfluidics offer potential for plasma separation but raise concerns about Joule heating.
  • Developing integrated microsystems for blood analysis requires efficient and gentle plasma extraction techniques.

Purpose of the Study:

  • To introduce a novel plasmapheresis device integrated into a point-of-care blood analysis microsystem.
  • To investigate the efficacy of electrothermal convective rolls for plasma extraction in physiological fluids.
  • To assess the quality and utility of plasma extracted using the developed device.

Main Methods:

  • Fabrication of microfluidic channels with 3D microelectrodes using a single-mask process.
  • Utilizing electrothermal convective rolls driven by specific voltage and frequency (±10 Vp at 650 kHz).
  • Assessing plasma purity, quality (hemolysis, denaturation), and protein recovery using flow cytometry, spectroscopy, and microparticle image velocimetry.

Main Results:

  • Achieved high plasma extraction yield (70%) and purity (nearly 99%) from small blood volumes (1.5 μL).
  • Demonstrated comparable plasma quality to conventional methods, with no evidence of hemolytic stress or protein denaturation.
  • Showcased high target molecule recovery (97% of proteins) and validated utility by detecting prostate-specific antigen.

Conclusions:

  • The novel plasmapheresis device effectively uses electrothermal convective rolls for high-yield, high-purity plasma extraction at the point-of-care.
  • The extracted plasma is of acceptable quality for downstream analysis, including biomarker detection.
  • This integrated microsystem represents a significant advancement for rapid blood diagnostics.