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Surface rheological observations on human plasma.

A Matrai, B Warburton, J A Dormandy

    Biorheology. Supplement : the Official Journal of the International Society of Biorheology
    |January 1, 1984
    PubMed
    Summary
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    This study reveals a transient viscous surface layer in human plasma, crucial for understanding haemorheology and disease pathology. Surface rheology measurements demonstrate this dynamic layer

    Area of Science:

    • Biophysics
    • Haemorheology
    • Biochemistry

    Background:

    • Weak interactions between plasma proteins are significant in haemorheology and disease pathology.
    • Surface rheology offers a method to study forces between adsorbed protein molecules.

    Purpose of the Study:

    • To investigate the surface rheological properties of human plasma.
    • To characterize the dynamic behavior of surface-adsorbed plasma proteins.

    Main Methods:

    • Development of a surface rheological measuring head for the Contraves LS-30 viscometer.
    • Analysis of plasma samples from healthy human subjects.

    Main Results:

    • A rapidly developing viscous surface layer was observed in human plasma, peaking at 30-60 seconds.

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  • The surface viscosity decreased to zero within 8-20 minutes, independent of shearing.
  • No significant differences were found between plasma samples treated with heparin or EDTA.

    • Conclusions:

    • The observed transient viscous surface layer in plasma is a dynamic phenomenon.
    • This phenomenon's time course correlates with thrombocyte and white blood cell adherence to surfaces.
    • Surface rheology provides insights into plasma protein interactions relevant to haemorheology and disease.