Related Experiment Videos
Development of viscoelasticity in heated hemoglobin solutions
G H Müller1, H Schmid-Schönbein, H J Meiselman
1Department of Physiology, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany.
Biorheology
|March 1, 1992
Summary
Heating red blood cells (RBCs) alters their rheological properties. This study shows heat-treated hemoglobin (Hb) solutions develop measurable elasticity, indicating cytoplasmic changes contribute to altered RBC behavior.
Area of Science:
- Biophysics
- Hematology
- Materials Science
Background:
- Red blood cell (RBC) rheology is crucial for circulation.
- Heat exposure (47-48.8°C) irreversibly alters RBC membrane elasticity and viscosity.
- Previous studies assumed heat-induced rheological changes were solely membrane-specific.
Purpose of the Study:
- To investigate the effects of heat treatment on the viscoelasticity of hemoglobin (Hb) solutions.
- To determine if heat-induced alterations in RBC rheology are solely membrane-dependent.
Main Methods:
- Prepared Hb solutions (30-45 g/100 ml) from normal human RBCs.
- Heat-treated Hb solutions at 48.8 ± 0.1°C for 3 to 20 minutes.
- Measured viscous component (VC) and elastic component (EC) using Couette and capillary rheometers at 25°C and shear rates of 1-200 s⁻¹.
Main Results:
- Unheated Hb solutions were Newtonian and non-elastic.
- Heat treatment for ≥3 minutes induced measurable elasticity in Hb solutions.
- Both VC and EC increased with heating time.
- EC magnitude depended inversely on shear rate and directly on Hb concentration and heating duration.
Conclusions:
- Heat treatment induces viscoelastic changes in Hb solutions, not just RBC membranes.
- Both cytoplasmic (Hb) and membrane viscoelasticity contribute to altered RBC rheology after heat exposure.
- These findings necessitate a broader understanding of heat-induced RBC damage mechanisms.