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The molecular compression of dextran.

A G Ogston, B N Preston

    The Biochemical Journal
    |October 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Flexible dextran molecules shrink in solution due to increased concentration, driven by molecular forces and viscosity changes. This osmotic compression aligns with theoretical predictions and impacts concentrated systems.

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    Area of Science:

    • Polymer science
    • Physical chemistry
    • Biophysics

    Background:

    • Dextran, a flexible-chain polysaccharide, exhibits complex behavior in concentrated solutions.
    • Understanding molecular behavior in concentrated systems is crucial for various scientific applications.

    Purpose of the Study:

    • To investigate and quantify the osmotic compression of dextran molecules in solution.
    • To explore the relationship between molecular forces, dextran characteristics, and viscosity.
    • To compare dextran's behavior with compact structures like albumin and Percoll.

    Main Methods:

    • Theoretical modeling of molecular shrinkage due to intra- and inter-molecular forces.
    • Estimation of molecular compression using viscosity measurements.
    • Comparison with macroscopic shrinkage data from cross-linked dextran (Sephadex) beads.

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    Main Results:

    • Experimental estimates of dextran compression agreed well with theoretical predictions.
    • Viscosity measurements provided a reliable method for estimating molecular compression.
    • Compact structures (albumin, Percoll) showed contrasting behavior to dextran, indicating different compression mechanisms.

    Conclusions:

    • Osmotic compression is a significant phenomenon for flexible-chain polymers like dextran in concentrated solutions.
    • Molecular compression influences transport processes and thermodynamic properties of concentrated systems.
    • Dextran's behavior differs markedly from compact macromolecules, highlighting the importance of molecular architecture.