Acoustic erythrocytometer for mechanically probing cell viscoelasticity

Area of Science:

• Biophysics
• Microfluidics
• Cell Mechanics

Background:

• Red blood cells (erythrocytes) are crucial for oxygen transport.
• Understanding erythrocyte mechanical properties is vital for diagnosing blood disorders.
• Existing techniques often provide averaged data, limiting single-cell insights.

Purpose of the Study:

• To develop and validate an acoustic device for single red blood cell mechanical analysis.
• To quantify the static and dynamic deformation of individual erythrocytes.
• To characterize the viscoelastic properties of red blood cells at single-cell resolution.

Main Methods:

• Utilizing a microfluidic channel with surface acoustic waves to create a standing acoustic field.
• Manipulating and deforming individual red blood cells at the nodes of the acoustic field.
• Measuring cell deformation using the Taylor deformation index (D) and relaxation times (τ1, τ2).

Main Results:

• The acoustic device successfully probed individual red blood cells.
• Static and dynamic deformation of erythrocytes were quantified.
• Viscous and elastic properties were determined, providing a viscoelastic fingerprint for each cell.

Conclusions:

• The developed acoustic device enables precise, single-cell mechanical analysis of red blood cells.
• This method overcomes the limitations of techniques yielding averaged values.
• The technology offers potential for high-throughput analysis and improved diagnostics.