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Osmotic pressure exerted by entangled polysaccharide chains.

H J Granger, S H Laine, G A Laine

    Microcirculation, Endothelium, and Lymphatics
    |February 1, 1985
    PubMed
    Summary
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    This study investigated the osmotic pressure of neutral and charged polysaccharides, finding non-linear relationships that deviate from ideal behavior. These findings suggest a mechanism for volume buffering in biological tissues.

    Area of Science:

    • Polymer Science
    • Biophysics
    • Physical Chemistry

    Background:

    • Polysaccharides are crucial biopolymers with significant roles in biological systems.
    • Understanding their osmotic behavior is key to comprehending tissue fluid dynamics.
    • Non-ideal osmotic behavior in concentrated solutions is a complex phenomenon.

    Purpose of the Study:

    • To investigate the osmotic pressure-concentration relationships of neutral and charged polysaccharides.
    • To compare the behavior of neutral dextran with charged hyaluronate.
    • To explore the influence of ionic strength on the osmotic activity of polysaccharides.

    Main Methods:

    • Membrane osmometry was employed to measure osmotic pressure.
    • Two neutral dextran fractions with different molecular weights were analyzed.

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  • Charged hyaluronate was studied across varying sodium chloride (NaCl) concentrations.

    • Main Results:

    • Both neutral dextran and charged hyaluronate exhibited non-linear osmotic pressure-mass concentration relationships.
    • The osmotic behavior of hyaluronate was dependent on NaCl concentration, indicating ionic strength effects.
    • Increasing ionic strength reduced the oncotic activity of hyaluronate at specific concentrations.

    Conclusions:

    • The non-ideal osmotic behavior of polysaccharides aligns with statistical thermodynamic models.
    • Non-linear relationships in matrix biopolymers may serve as a volume buffering mechanism in the interstitium.
    • This research provides insights into the physical chemistry of biopolymer solutions and their physiological implications.