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Related Experiment Video

Updated: Jun 5, 2026

Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy
08:03

Quantitative Analysis of Viscoelastic Properties of Red Blood Cells Using Optical Tweezers and Defocusing Microscopy

Published on: March 25, 2022

Measuring micro-interactions between coagulating red blood cells using optical tweezers.

Bor-Wen Yang1, Zhe Li

  • 1Department of Opto-electronic System Engineering, Minghsin University of Science and Technology, 
Hsinchu, Taiwan, 30401, China.

Biomedical Optics Express
|January 25, 2011
PubMed
Summary

Heparin and tranexamic acid impact blood coagulation dynamics. Heparin slows RBC interaction, while tranexamic acid accelerates the process, affecting hemostasis management.

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Area of Science:

  • Biophysics
  • Hematology
  • Biomaterials

Background:

  • Hemostasis is crucial for managing vascular diseases and bleeding disorders.
  • Agents altering hemostasis are vital therapeutic tools.
  • Understanding coagulation dynamics at the cellular level is key.

Purpose of the Study:

  • To investigate the effects of heparin and tranexamic acid on red blood cell (RBC) coagulation.
  • To quantify micro-interactions during blood coagulation using optical tweezers.
  • To elucidate the distinct impacts of heparin and tranexamic acid on coagulation phases.

Main Methods:

  • Utilized optical tweezers to measure pN-range micro-interactions between coagulating RBCs.
  • Assessed cellular mobility and interaction intensity to define coagulation phases.

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  • Observed variations in cellular interactions under the influence of heparin and tranexamic acid.

    • Main Results:

    • The blood coagulation process was delineated into three distinct phases based on RBC mobility and interaction.
    • Heparin was found to attenuate RBC interactions, extending the initial coagulation phase.
    • Tranexamic acid accelerated coagulation, causing samples to bypass early phases and proceed directly to the final phase.

    Conclusions:

    • Heparin and tranexamic acid exert differential effects on the kinetics of blood coagulation.
    • Optical tweezers provide a sensitive method for studying micro-interactions in hemostasis.
    • These findings offer insights into the mechanisms of anticoagulant and procoagulant agents.