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Related Experiment Videos

Hemoglobin charge dependence on hemoglobin concentration in vitro.

C M Gary-Bobo, A K Solomon

    The Journal of General Physiology
    |March 1, 1971
    PubMed
    Summary

    Hemoglobin molecule charge decreases with increasing concentration, impacting red blood cell behavior. This study confirms concentration-dependent hemoglobin net charge influences red cell osmotic properties.

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    Area of Science:

    • Biochemistry
    • Physical Chemistry
    • Physiology

    Background:

    • The net charge of hemoglobin (Hb) is crucial for understanding red blood cell (RBC) physiology.
    • Previous research suggests concentration-dependent changes in Hb charge may explain anomalous osmotic behavior in RBCs.

    Purpose of the Study:

    • To investigate the dependence of hemoglobin molecule charge on hemoglobin concentration.
    • To provide further evidence for the role of Hb net charge in RBC osmotic properties.

    Main Methods:

    • Measured the distribution of potassium-42 ((42)K) between a hemoglobin solution and an external solution.
    • Utilized a cellophane bag to contain the hemoglobin solution.
    • Maintained specific conditions: pH 6.6, 10 mM K+ concentration, and 4°C.

    Main Results:

    • Hemoglobin charge decreased sigmoidally with increasing concentration, from +3 in dilute solutions to +0.5 in concentrated solutions (3-11 mmolal).
    • Results closely matched earlier studies using chloride distribution.
    • Findings support the hypothesis that concentration-dependent Hb charge changes explain RBC osmotic anomalies.

    Conclusions:

    • Concentration-dependent changes in hemoglobin net charge are confirmed.
    • These charge variations are a key factor in the osmotic behavior of human red blood cells.
    • Red cell water functions as bulk water, supporting solutes like potassium and chloride.

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